Update actions/cache action to v6 (#1643)

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

.github/workflows/release.yml

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0265098..f1122bb 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,7 +14,7 @@
       - name: Checkout
         uses: actions/checkout@v7
       - name: Mount bazel caches
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: |
             ~/.cache/bazel-disk-cache