Update GitHub Action Swatinem/rust-cache to v2.8.1 (#76)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/rust.yml

@@ -74,7 +74,7 @@ jobs:
           working-directory: ${{ matrix.directory }}
 
       - name: Cache Rust dependencies
-        uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
+        uses: Swatinem/rust-cache@f13886b937689c021905a6b90929199931d60db1 # v2.8.1
         with:
           workspaces: ${{ matrix.directory }}
           save-if: ${{ !startsWith(github.ref, 'refs/heads/gh-readonly-queue') }}
@@ -158,7 +158,7 @@ jobs:
           working-directory: ${{ matrix.directory }}
 
       - name: Cache Rust dependencies
-        uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
+        uses: Swatinem/rust-cache@f13886b937689c021905a6b90929199931d60db1 # v2.8.1
         with:
           workspaces: ${{ matrix.directory }}
           key: ${{ matrix.profile }}