Enable pip cache in GitHub Actions CI jobs #576
Merged
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This enables the cache for dependencies that are installed with pip in GH Actions jobs, while ensuring that all dependencies are upgraded (also the non-direct dependencies) by using the eager upgrade-strategy.
Test runs show that caching shortens the job run times ~30 s on average.
I leave this PR as draft, because this branch is based on
resolve-deprecation-warnings
branch (some unit tests started failing due to pkg_resources), so #575 should be merged first.