⬆️ deps: Update actions/cache action to v5 (#219)

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

Author: renovate[bot]

.github/workflows/rcalc-test.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Run llvm-config
         run: llvm-config --version --bindir --libdir
       - name: Cache cargo build
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         id: cargo-cache
         with:
           path: |