Merge #2520

2520: Use nightly for cargo fmt in CI (for `release-v0.28.0` branch) r=Kerollmops a=curquiza

Following https://github.com/meilisearch/meilisearch/pull/2519

Co-authored-by: Clémentine Urquizar <clementine@meilisearch.com>

.github/workflows/rust.yml

@@ -83,7 +83,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: nightly
+          toolchain: stable
           override: true
           components: rustfmt
       - name: Cache dependencies