Hash-pin GitHub Actions, set up grouped dependabot updates #386
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Fixes https://bugs.launchpad.net/lxml/+bug/2043502.
This PR hash-pins GitHub Actions used in the CI/CD workflows, hardening the project against broken or malicious releases.
It also configures dependabot to use grouped updates, with a single PR updating all Actions with new versions.
Regardless of whether you merge this PR, I also suggest enabling Dependabot's security updates in the repo Settings > Code security & analysis. Dependabot will then send emergency PRs as soon as a dependency (an Action or the Cython in the requirements.txt) has a known vulnerability.