Adopt the recent GitHub Actions updates identified by dependabot #1130
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Because we typically make housekeeping changes into our stable branch, and because dependabot is configured to make its updates to main (rather than the stable branch), I figured I would gather all of its changes into a PR to stable, and then merge it here first before merging stable into main. The CI is in better shape in the stable branch, anyway.
Supersedes #1124, #1125, #1126, #1127.