Bump dtolnay/rust-toolchain

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from a54c7afa936fefeb4456b2dd8068152669aa8203 to 56f84321dbccf38fb67ce29ab63e4754056677e0.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@a54c7af...56f8432)

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

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

Author: dependabot[bot]

.github/workflows/packaging.yml

@@ -27,7 +27,7 @@ jobs:
           version: 1
 
       - name: Install toolchain
-        uses: dtolnay/rust-toolchain@a54c7afa936fefeb4456b2dd8068152669aa8203
+        uses: dtolnay/rust-toolchain@56f84321dbccf38fb67ce29ab63e4754056677e0
         with:
           toolchain: "stable"
           components: "llvm-tools"
@@ -93,7 +93,7 @@ jobs:
           path: target/pkg/
 
       - name: Install toolchain
-        uses: dtolnay/rust-toolchain@a54c7afa936fefeb4456b2dd8068152669aa8203
+        uses: dtolnay/rust-toolchain@56f84321dbccf38fb67ce29ab63e4754056677e0
         with:
           toolchain: "stable"
           components: "llvm-tools"