chore(deps): update all github action dependencies

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

Author: renovate[bot]

.github/workflows/build-envoy-image-ci.yaml

@@ -33,7 +33,7 @@ jobs:
         uses: docker/setup-buildx-action@d7f5e7f509e45cec5c76c4d5afdd7de93d0b3df5 # v4.1.0
 
       - name: Cache Docker layers
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
         with:
           path: /tmp/buildx-cache
           key: docker-cache-${{ github.head_ref }}

.github/workflows/build-envoy-images-release-base.yaml

@@ -62,7 +62,7 @@ jobs:
         echo "BUILDER_DOCKER_HASH=$(git ls-tree --full-tree HEAD -- ./Dockerfile.builder | awk '{ print $3 }')" >> $GITHUB_ENV
 
     - name: Cache Docker layers
-      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+      uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
       with:
         path: /tmp/buildx-cache
         key: docker-cache-tests
@@ -167,7 +167,7 @@ jobs:
         tags: quay.io/${{ github.repository_owner }}/cilium-envoy-builder:${{ github.ref_name }}-archive-latest
 
     - name: Cache Docker layers
-      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+      uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
       with:
         path: /tmp/buildx-cache
         key: docker-cache-${{ github.ref_name }}

.github/workflows/ci-tests.yaml

@@ -44,7 +44,7 @@ jobs:
         uses: docker/setup-buildx-action@d7f5e7f509e45cec5c76c4d5afdd7de93d0b3df5 # v4.1.0
 
       - name: Cache Docker layers
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
         with:
           path: /tmp/buildx-cache
           key: docker-cache-tests