chore(deps): update swatinem/rust-cache action to v2.8.1 (#20)

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

Author: renovate[bot]

action.yml

@@ -79,7 +79,7 @@ runs:
         git restore . # restore rust-toolchain.toml change
 
     - name: Cache on ${{ github.ref_name }}
-      uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
+      uses: Swatinem/rust-cache@f13886b937689c021905a6b90929199931d60db1 # v2.8.1
       if: ${{ inputs.restore-cache == 'true' }}
       with:
         shared-key: ${{ inputs.cache-key }}