ci: bump dtolnay/rust-toolchain (indygreg#318)

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from b3b07ba8b418998c39fb20f53e8b695cdcc8de1b to fa04a1451ff1842e2626ccb99004d0195b455a88.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@b3b07ba...fa04a14)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: fa04a1451ff1842e2626ccb99004d0195b455a88
  dependency-type: direct:production
...

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Author: dependabot[bot]

.github/workflows/test.yml

@@ -80,7 +80,7 @@ jobs:
 
       - name: Install Rust
         if: matrix.arch != 'x86'
-        uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # v1
+        uses: dtolnay/rust-toolchain@fa04a1451ff1842e2626ccb99004d0195b455a88 # v1
         with:
           toolchain: stable