Check CI on Julia v1.7

[ranocha]

We get the following problems:

• tree_part1:

  ┌ Warning: Package Trixi does not have Flux in its dependencies:
  │ - If you have Trixi checked out for development and have
  │   added Flux as a dependency but haven't updated your primary
  │   environment's manifest file, try `Pkg.resolve()`.
  │ - Otherwise you may need to report an issue with Trixi
  └ Loading Flux into Trixi from project dependency, future warnings for Trixi are suppressed.
  

• tree_part2: Some test failures of elixir_euler_kelvin_helmholtz_instability_amr_neuralnetwork_perssonperaire.jl
• structured:

  elixir_advection_restart.jl with waving flag mesh: Test Failed at /home/runner/work/Trixi.jl/Trixi.jl/test/test_trixi.jl:77
    Expression: isapprox(linf_expected, linf_actual, atol = 1.1102230246251565e-13, rtol = 5.0e-7)
     Evaluated: isapprox(0.0015194298895079283, 0.0015194252169410394; atol = 1.1102230246251565e-13, rtol = 5.0e-7)
  

• misc_part1:

  plotting TimeIntegratorSolution: Test Failed at /home/runner/work/Trixi.jl/Trixi.jl/test/test_trixi.jl:129
    Expression: isempty(stderr_content)
     Evaluated: isempty("┌ Warning: Interrupted. Larger maxiters is needed.\n└ @ Trixi ~/work/Trixi.jl/Trixi.jl/src/time_integration/methods_3Sstar.jl:215\n")
  

• misc_part1:

  plotting multiple variables: Test Failed at /home/runner/work/Trixi.jl/Trixi.jl/test/test_trixi.jl:129
    Expression: isempty(stderr_content)
     Evaluated: isempty("┌ Warning: Keyword argument letter not supported with Plots.GRBackend().  Choose from: Set([:top_margin, :group, :inset_subplots, :background_color, :ytickfontsize, :yforeground_color_text, :yguidefontcolor, :tickfontfamily, :show_empty_bins, :seriesalpha, :seriescolor, :ztick_direction, :xgrid, :ygridalpha, :zlims, :xtick_direction, :colorbar, :legend_font_family, :zflip, :ticks, :linealpha, :overwrite_figure, :arrow, :xguidefonthalign, :normalize, :linestyle, :xtickfontvalign, :xflip, :zgrid, :fillcolor, :ygrid, :bar_width, :colorbar_scale, :background_color_inside, :zguidefonthalign, :bins, :zguide, :zforeground_color_text, :legend_font_valign, :yscale, :legend_font_color, :weights, :xgridalpha, :ygridstyle, :clims, :xtickfontcolor, :fill_z, :xguide, :markershape, :background_color_subplot, :ztickfontfamily, :fillalpha, :markerstrokewidth, :tick_direction, :xguidefontvalign, :xguidefontfamily, :gridlinewidth, :foreground_color_subplot, :xgridlinewidth, :yguidefontsize, :foreground_color, :foreground_color_text, :titlefonthalign, :yerror, :x, :xtickfonthalign, :zgridlinewidth, :ytickfontrotation, :discrete_values, :ytick_direction, :grid, :xguidefontrotation, :ribbon, :xguidefontsize, :tickfontrotation, :xforeground_color_axis, :xdiscrete_values, :background_color_outside, :titlefontcolor, :xgridstyle, :line_z, :size, :orientation, :gridstyle, :projection, :markersize, :legend_foreground_color, :camera, :zguidefontrotation, :ydiscrete_values, :xforeground_color_grid, :seriestype, :yflip, :quiver, :zticks, :markerstrokecolor, :ztickfontrotation, :ztickfonthalign, :fillrange, :ztickfontvalign, :xlims, :xforeground_color_border, :markercolor, :xtickfontsize, :ylink, :levels, :color_palette, :connections, :yforeground_color_grid, :lims, :zgridstyle, :foreground_color_border, :zguidefontvalign, :xscale, :marker_z, :markerstrokealpha, :left_margin, :markeralpha, :legend_font_halign, :annotations, :window_title, :tickfontvalign, :foreground_color_axis, :zguidefontcolor, :ygridlinewidth, :zlink, :zscale, :smooth, :yguidefontrotation, :xticks, :guidefontsize, :zguidefontsize, :y, :margin, :ytickfontcolor, :zdiscrete_values, :tickfonthalign, :bottom_margin, :yforeground_color_border, :zguidefontfamily, :framestyle, :yguidefontvalign, :yguidefonthalign, :zerror, :zgridalpha, :ztickfontcolor, :scale, :legend_position, :linecolor, :html_output_format, :legend_title, :zforeground_color_border, :legend_font_pointsize, :title, :tickfontcolor, :subplot_index, :flip, :titlefontrotation, :legend_background_color, :tickfontsize, :titlefontvalign, :z, :yforeground_color_axis, :foreground_color_grid, :xtickfontrotation, :linewidth, :ztickfontsize, :gridalpha, :xerror, :guidefontfamily, :ylims, :contour_labels, :xguidefontcolor, :primary, :xtickfontfamily, :ytickfontvalign, :guidefonthalign, :ytickfontfamily, :aspect_ratio, :xforeground_color_text, :show, :link, :colorbar_title, :guidefontrotation, :subplot, :label, :ytickfonthalign, :guide, :guidefontcolor, :yguide, :titlefontsize, :titlefontfamily, :guidefontvalign, :zforeground_color_axis, :zforeground_color_grid, :layout, :legend_font_rotation, :colorbar_entry, :yguidefontfamily, :polar, :right_margin, :xlink, :series_annotations, :yticks])\n└ @ Plots ~/.julia/packages/Plots/PomtQ/src/args.jl:1608\n")
  

[ranocha]

@sloede Since you have supervised the neural network stuff, could you please check and fix the test failures of elixir_euler_kelvin_helmholtz_instability_amr_neuralnetwork_perssonperaire.jl?

[sloede]

Some minor questions/comments, but overall LGTM.

[codecov]

Codecov Report

Merging #985 (8f2acd2) into main (4814ed1) will increase coverage by 2.99%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #985      +/-   ##
==========================================
+ Coverage   93.59%   96.59%   +2.99%     
==========================================
  Files         298      298              
  Lines       23054    23054              
==========================================
+ Hits        21577    22267     +690     
+ Misses       1477      787     -690     

Flag	Coverage Δ
unittests	96.59% <0.00%> (+2.99%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Trixi.jl	66.67% <0.00%> (ø)
src/solvers/dgsem/basis_lobatto_legendre.jl	88.89% <0.00%> (+0.34%)	⬆️
src/visualization/types.jl	94.82% <0.00%> (+0.52%)	⬆️
src/solvers/dgsem_tree/dg_2d_parallel.jl	100.00% <0.00%> (+0.58%)	⬆️
src/visualization/utilities.jl	89.89% <0.00%> (+0.60%)	⬆️
src/meshes/p4est_mesh.jl	99.05% <0.00%> (+0.68%)	⬆️
src/callbacks_step/amr_dg3d.jl	99.19% <0.00%> (+0.81%)	⬆️
src/callbacks_step/amr_dg1d.jl	96.72% <0.00%> (+0.82%)	⬆️
src/meshes/unstructured_mesh.jl	99.12% <0.00%> (+0.88%)	⬆️
src/meshes/parallel_tree.jl	100.00% <0.00%> (+0.96%)	⬆️
... and 140 more

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