Fix Warnings in CI

[TimPansino]

Overview

• chown the pip cache on CI runners to silence a warning from pip.
• Update all actions using Node16 to Node20 versions to silence Github warnings.

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ YAML	prettier	4	0	0	0.86s
✅ YAML	v8r	4		0	2.99s
✅ YAML	yamllint	4		0	0.4s

See detailed report in MegaLinter reports _Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff_

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