Add Dependabot to update github actions and pin actions to hash #163
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This PR pins github actions to hashes (rather than versions) as recommended by github:
https://wellarchitected.github.com/library/application-security/scenarios-and-recommendations/actions-security/#pin-versions-of-actions
and enables dependabot to check these monthly. Dependabot will open PRs requesting updates when new versions of actions are released.