Bump actions/cache from 5 to 6 (#1411)

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Author: dependabot[bot]

.github/workflows/bazel.yml

@@ -22,7 +22,7 @@ jobs:
           submodules: recursive
 
       - name: Mount bazel cache
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           # See https://docs.bazel.build/versions/master/output_directories.html
           path: "~/.cache/bazel"