Update used actions, remove unused parts

[rsvoboda]

Update used actions, remove unused parts, fixes warnings in GH action summary page

• Replace deprecated ::set-output in GH Actions
• Make sure GitHub Actions are updated by dependabot
• Update used actions, remove unused parts

Please check the relevant options

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Dependency update
• Refactoring
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• This change requires execution against OCP (use run tests phrase in comment)

Checklist:

• Example scenarios has been updated / added
• Methods and classes used in PR scenarios are meaningful
• Commits are well encapsulated and follow the best practices

[michalvavrik]

lgtm, thanks