Merge #2519

2519: Use nightly for cargo fmt in CI r=Kerollmops a=curquiza

Rustfmt CI currently does not pass on main with nightly, see https://github.com/meilisearch/meilisearch/pull/2517#issuecomment-1156138216

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