Use {vdiffr}; Update GHA; Update "print on CI / examples" method; Fix lints

[schloerke]

Use rstudio/shiny-workflows GHA files

[codecov-commenter]

Codecov Report

Merging #453 (c1c22da) into master (e4217fe) will decrease coverage by 0.01%.
The diff coverage is 94.83%.

❗ Current head c1c22da differs from pull request most recent head 7ebfc56. Consider uploading reports for the commit 7ebfc56 to get more accurate results

@@            Coverage Diff             @@
##           master     #453      +/-   ##
==========================================
- Coverage   92.09%   92.07%   -0.02%     
==========================================
  Files          36       36              
  Lines        4362     4365       +3     
==========================================
+ Hits         4017     4019       +2     
- Misses        345      346       +1     

Impacted Files	Coverage Δ
R/deprecated.R	45.03% <0.00%> (ø)
R/geom_stripped_rows.R	50.00% <ø> (ø)
R/ggmatrix_gtable.R	97.08% <ø> (ø)
R/ggmatrix_gtable_helpers.R	94.64% <ø> (ø)
R/ggmatrix_legend.R	95.45% <ø> (ø)
R/ggmatrix_make_plot.R	100.00% <ø> (ø)
R/ggmatrix_print.R	66.66% <ø> (ø)
R/ggmatrix_progress.R	72.72% <ø> (ø)
R/stat_prop.R	67.64% <ø> (ø)
R/utils.R	58.33% <0.00%> (-5.31%)	⬇️
... and 19 more

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