chore(deps): update actions/cache action to v5

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

Author: renovate[bot]

.github/actions/cargo-cache/action.yml

@@ -4,7 +4,7 @@ runs:
   using: composite
   steps:
     - name: Cache .cargo directory
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           ~/.cargo/bin/