Update .github workflows

[RuneDominik]

This updates the workflows to the newest version and adds a test setup for python 3.11.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (642940a) 94.33% compared to head (05a5274) 94.33%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #242   +/-   ##
=======================================
  Coverage   94.33%   94.33%           
=======================================
  Files          58       58           
  Lines        2738     2738           
=======================================
  Hits         2583     2583           
  Misses        155      155           

Impacted Files	Coverage Δ
.../interpolation/tests/test_griddata_interpolator.py	100.00% <100.00%> (ø)

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[maxnoe]

Thanks!

As per NEP-29, we can also drop 3.8 now:

On Apr 14, 2023 drop support for Python 3.8 (initially released on Oct 14, 2019)

[RuneDominik]

Thanks!

As per NEP-29, we can also drop 3.8 now:

On Apr 14, 2023 drop support for Python 3.8 (initially released on Oct 14, 2019)

If we want this I'll make this a new PR, arguably we could wait for ctapipe to make this move as pyirf likely will become a dependency there sometime and we may want to aim for consistency throughout cta-observatory packages. However, even them requiring python >= 3.8 and us python >= 3.9 is ofc. solvable.

[maxnoe]

The PR for this in ctapipe is already open. But that's kind of besides the point. The consistency here is via NEP 29, as soon as we make a new non-bugfix release, we drop versions accordingly.