ci: Resolve ref-version-mismatch, stale-action-refs, and unpinned-uses

[hashcatHitman]

In pursuit of getting more zizmor lints enforced across rust-lang repos through crabwatch, this PR fixes all findings of the ref-version-mismatch, stale-action-refs, and unpinned-uses rules (only unpinned-uses actually had findings in this repo).

For the change to the josh-sync/rustc-pull action, see: #t-infra > josh-sync pull workflow version pinning

The hash pin format is supported by tools like Dependabot and Renovate, which can update the pinned hashes and their associated comments. If you'd like help setting either of those up, let me know which you prefer, and if you'd like it in this PR or a new one.

[rustbot]

r? @sayantn

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• Owners of files modified in this PR: @Amanieu, @adamgemmell, @davidtwco, @folkertdev, @sayantn
• @Amanieu, @adamgemmell, @davidtwco, @folkertdev, @sayantn expanded to Amanieu, adamgemmell, davidtwco, folkertdev, sayantn
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[hashcatHitman]

As far as I can tell, there's no reason why my changes should be causing any CI failures. I think this might be related to the multiple incidents GitHub has been having today (See: #t-infra > github status @ 💬). I'll push an empty amend commit to rerun and see if they fix themselves.

[hashcatHitman]

Ok, well... I'm not sure what the issue is. It just seems like CI is flaky? My changes shouldn't actually change anything about the way CI currently works.

In the first run:

• Test (dev, aarch64_be-unknown-linux-gnu, ubuntu-latest) succeeded
• Test (dev, riscv64gc-unknown-linux-gnu, ubuntu-latest) failed with exit code 143
• Intrinsic Test (aarch64_be-unknown-linux-gnu, dev, gcc) failed with exit code 143
• Intrinsic Test (x86_64-unknown-linux-gnu, icx, release) never got to finish

In the second run:

• Test (dev, aarch64_be-unknown-linux-gnu, ubuntu-latest) failed with exit code 137
• Test (dev, riscv64gc-unknown-linux-gnu, ubuntu-latest) never got to finish
• Intrinsic Test (aarch64_be-unknown-linux-gnu, dev, gcc) succeeded
• Intrinsic Test (x86_64-unknown-linux-gnu, icx, release) failed with exit code 143

[sayantn]

#2255

@rustbot reroll

[folkertdev]

Probably github being github? I'll close and reopen to retry (but it might need a rebase anyway)