Upgrade github action linter and fix issues

[jberthold]

PR #4849 pins the version of the github action linter to 1.7.8 to avoid build failures caused by using an unexpected type key in the github actions (not workflows).
Either the linter in version 1.7.9. is applying rules wrongly or the type key has become illegal recently in actions (Google's AI claims the key is valid in action inputs but not in workflow inputs).

• Upgrade linter to 1.7.9
• Fix linter errors in .github/actions/ that currently make the linter run fail.