ci: update actions and disable persisted git credentials #1578
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Summary
Disabling persisted credentials is a nice-to-have security improvement - it's very unlikely to ever actually be exploitable for this codebase, but might as well disable it nonetheless; see actions/checkout#485 for more.
Pull Request checklist
Add/update test to cover these changesUpdate documentationUpdate CHANGELOG fileThis change is![Reviewable](https://camo.githubusercontent.com/23b05f5fb48215c989e92cc44cf6512512d083132bd3daf689867c8d9d386888/68747470733a2f2f72657669657761626c652e696f2f7265766965775f627574746f6e2e737667)