subtree-push nightly-2024-06-13

[github-actions]

Bumping the toolchain version as part of a git subtree push

current toolchain (nightly-2023-12-28):

• 1.77.0-nightly (89e2160c4 2023-12-27)

latest toolchain (nightly-2024-06-13):

• 1.81.0-nightly (8337ba918 2024-06-12)

[github-actions]

There was an issue and this subtree-push can't automatically be merged ⚠️

1. Please checkout branch subtree-push-nightly-2024-06-13, fix any merge conflicts, and then run git merge upstream/subtree_push_automation --no-ff
2. Bump the toolchain listed in the rust-toolchain file to nightly-2024-06-13, and commit those changes.
3. Run the Diff-Check Job.
   • Diff-Check Job Parameters:
     • Git URL: https://github.com/ytmimi/rustfmt.git
     • Feature Branch: subtree-push-nightly-2024-06-13
4. Wait for CI checks to pass.