fix: Fixed deprecations in workflows and drop setup.py usages

[andruten]

Fixes deprecation warnings:

actions/setup-python@v2

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-python@v2, actions/cache@v2, codecov/codecov-action@v2.0.3. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

set-output

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

[codecov]

Codecov Report

Merging #174 (151934d) into master (695c5a9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #174   +/-   ##
=======================================
  Coverage   98.55%   98.55%           
=======================================
  Files           7        7           
  Lines         414      414           
  Branches       70       70           
=======================================
  Hits          408      408           
  Misses          3        3           
  Partials        3        3           

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