Bump dtolnay/rust-toolchain from 1.79.0 to 1.90.0

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from 1.79.0 to 1.90.0.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@1.79.0...1.90.0)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/rust.yml

@@ -90,7 +90,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@1.79.0
+      - uses: dtolnay/rust-toolchain@1.90.0
       - uses: Swatinem/rust-cache@v2
       - run: cargo check --workspace