Merge pull request #64 from palfrey/renovate/actions-cache-5.x

Update actions/cache action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -52,7 +52,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Mount bazel cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.cache/bazel
           key: ${{ runner.os }}-bazel-${{ hashFiles('MODULE.bazel.lock') }}