bump actions/setup-python from v1 to v5

[dennisbader]

Checklist before merging this PR:

• Mentioned all issues that this PR fixes or addresses.
• Summarized the updates of this PR under Summary.
• Added an entry under Unreleased in the Changelog. (not required)

Summary

• fixes broken CI runs for os=macos-latest runs. Before macos-latest pointed to macos-13, now it switched to ARM (see here). We fix it to macos-13 now, to fix the pipeline.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.01%. Comparing base (6f13a2f) to head (2fd6260).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2360      +/-   ##
==========================================
- Coverage   94.02%   94.01%   -0.02%     
==========================================
  Files         138      138              
  Lines       14201    14187      -14     
==========================================
- Hits        13353    13338      -15     
- Misses        848      849       +1     

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