CI: define only major version for all actions from Github

[ArneBinder]

especially for actions/cache to fix the version issue, see https://github.blog/changelog/2024-12-05-notice-of-upcoming-releases-and-breaking-changes-for-github-actions/#actions-cache-v1-v2-and-actions-toolkit-cache-package-closing-down for context

Note that our actions did not succeed although we use actions/cache >= 4 (v4.2.1).

Same as ArneBinder/pie-datasets#170.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.51%. Comparing base (65a225b) to head (14c42c0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #156   +/-   ##
=======================================
  Coverage   95.51%   95.51%           
=======================================
  Files          61       61           
  Lines        5212     5212           
=======================================
  Hits         4978     4978           
  Misses        234      234           

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