Bump dtolnay/rust-toolchain (#56)

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from f7ccc83f9ed1e5b9c81d8a67d7ad1a747e22a561 to efa25f7f19611383d5b0ccf2d1c8914531636bf9.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@f7ccc83...efa25f7)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: efa25f7f19611383d5b0ccf2d1c8914531636bf9
  dependency-type: direct:production
...

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Author: dependabot[bot]

.github/workflows/publish.yml

@@ -23,7 +23,7 @@ jobs:
           persist-credentials: false
       - &install-rust
         name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@f7ccc83f9ed1e5b9c81d8a67d7ad1a747e22a561
+        uses: dtolnay/rust-toolchain@efa25f7f19611383d5b0ccf2d1c8914531636bf9
         with:
           toolchain: stable
       - &generate-token