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[bot]]

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 22 commits behind head on master.

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

Additional details and impacted files

```diff @@ 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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