Pin GH Actions to commit sha (backport #146)

[mergify]

Related to: harvester/harvester#10279

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This is an automatic backport of pull request #146 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 0658443 has failed:

On branch mergify/bp/v1.7/pr-146
Your branch is up to date with 'origin/v1.7'.

You are currently cherry-picking commit 0658443.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .github/workflows/codeql-analysis.yml
	modified:   .github/workflows/scan.yml
	modified:   .github/workflows/template-build.yml

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .github/workflows/fossa.yml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally