Update actions/cache action to v5 (#120)

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -27,7 +27,7 @@ jobs:
       - name: "Checkout the sources"
         uses: actions/checkout@v6
       - name: Mount bazel caches
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/bazel
@@ -51,7 +51,7 @@ jobs:
       - name: "Checkout the sources"
         uses: actions/checkout@v6
       - name: Mount bazel caches
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/bazel