🌱 Bump dtolnay/rust-toolchain

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from bb45937a053e097f8591208d8e74c90db1873d07 to 21dc36fb71dd22e3317045c0c31a3f4249868b17.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@bb45937...21dc36f)

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

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install ${{ matrix.toolchain }}
-        uses: dtolnay/rust-toolchain@bb45937a053e097f8591208d8e74c90db1873d07
+        uses: dtolnay/rust-toolchain@21dc36fb71dd22e3317045c0c31a3f4249868b17
         with:
           toolchain: ${{ matrix.toolchain }}
           components: clippy
@@ -48,7 +48,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install ${{ matrix.toolchain }}
-        uses: dtolnay/rust-toolchain@bb45937a053e097f8591208d8e74c90db1873d07
+        uses: dtolnay/rust-toolchain@21dc36fb71dd22e3317045c0c31a3f4249868b17
         with:
           toolchain: ${{ matrix.toolchain }}
       - name: cargo generate-lockfile
@@ -66,7 +66,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install ${{ matrix.toolchain }}
-        uses: dtolnay/rust-toolchain@bb45937a053e097f8591208d8e74c90db1873d07
+        uses: dtolnay/rust-toolchain@21dc36fb71dd22e3317045c0c31a3f4249868b17
         with:
           toolchain: ${{ matrix.toolchain }}
       - name: cargo generate-lockfile
@@ -84,7 +84,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install ${{ matrix.toolchain }}
-        uses: dtolnay/rust-toolchain@bb45937a053e097f8591208d8e74c90db1873d07
+        uses: dtolnay/rust-toolchain@21dc36fb71dd22e3317045c0c31a3f4249868b17
         with:
           toolchain: ${{ matrix.toolchain }}
       - name: cargo generate-lockfile
@@ -101,7 +101,7 @@ jobs:
         with:
           submodules: true
       - name: Install nightly
-        uses: dtolnay/rust-toolchain@bb45937a053e097f8591208d8e74c90db1873d07
+        uses: dtolnay/rust-toolchain@21dc36fb71dd22e3317045c0c31a3f4249868b17
         with:
           toolchain: nightly
       - name: cargo doc