Bump dtolnay/rust-toolchain

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from be73d7920c329f220ce78e0234b8f96b7ae60248 to b3b07ba8b418998c39fb20f53e8b695cdcc8de1b.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@be73d79...b3b07ba)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: b3b07ba8b418998c39fb20f53e8b695cdcc8de1b
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/checks.yaml

@@ -54,7 +54,7 @@ jobs:
         with:
           persist-credentials: false
       - name: Install toolchain
-        uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+        uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b
         with:
           toolchain: nightly
           targets: "${{ matrix.target }}"
@@ -93,7 +93,7 @@ jobs:
         with:
           persist-credentials: false
       - name: Install nightly toolchain
-        uses: dtolnay/rust-toolchain@be73d7920c329f220ce78e0234b8f96b7ae60248
+        uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b
         with:
           toolchain: nightly
       - name: Install cargo fuzz