Merge for v8.3

[raphaelquast]

A new minor release that brings a few features and a much improved documentation!

🌳 New

• There is a new method ScaleBar.set_rotation to set the rotation-angle of a scalebar.
• m.set_frame(gdf=...) can now be used to set arbitrary map-boundaries based on geopandas.GeoDataFrames
  (multipolygon support requires upcoming cartopy v0.24 release)
• There is a new contextmanager Maps.delay_draw that can be used to delay intermediate draw-events and speed up the creation of complex figures.

📖 Documentation updates and new theme

🚀 Big thanks to @Fanchengyan for his efforts to improve the documentation!

• Docs now use the PyData Sphinx Theme
  
• New improved example gallery based on myst_sphinx_gallery

🔨 Fixes

• Fix issues with "inherit_position=False" for colorbars
• Make sure cached layers are re-drawn if a colorbar changes the axes-size
• Fix treatment of assigned "search_radius" for pick callbacks if 1D brute-force search is used
• Update GitHub actions and documentation dependencies

[codecov]

Codecov Report

Attention: Patch coverage is 52.38095% with 30 lines in your changes missing coverage. Please review.

Project coverage is 75.04%. Comparing base (f9d9e82) to head (eaf323b).
Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
eomaps/eomaps.py	30.00%	28 Missing ⚠️
eomaps/helpers.py	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #246      +/-   ##
==========================================
- Coverage   75.15%   75.04%   -0.11%     
==========================================
  Files          27       27              
  Lines       11850    11878      +28     
==========================================
+ Hits         8906     8914       +8     
- Misses       2944     2964      +20     

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