CI: Use hashes for GitHub Action versions #1116
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See https://blog.rafaelgss.dev/why-you-should-pin-actions-by-commit-hash for motivation why this is the safer way to handle action versions.
Also updated the doc to a recent version of the checkout action.
One may consider activating the dependabot action, see https://github.com/apytypes/apytypes/blob/main/.github/dependabot.yml for an example (although one may consider checking weekly rather than monthly). This will create a PR to update the versions/hashes to the latest version when a new one is available.