ci: update to use pinned actions

[patrick-stephens]

Updated CI with pinact to use actions pinned to hashes, this also allows us to require that in the repo configuration now.

Tweaked some of the linting to follow the main Fluent Bit repo with more controlled actions.

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📥 Commits

Reviewing files that changed from the base of the PR and between b476255 and 028c69d.

📒 Files selected for processing (5)

• .github/workflows/cron-stale.yaml
• .github/workflows/linkcheck.yaml
• .github/workflows/pr-example-validation.yaml
• .github/workflows/pr-lint.yaml
• .pinact.yaml

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