chore(deps): update actions/cache action to v4.2.3

Author: my-renovate[bot]

.github/workflows/pr-slack-notification.yml

@@ -55,7 +55,7 @@ jobs:
           echo "${TS}" > slack-message-timestamp.txt
 
       - name: Cache slack message timestamp
-        uses: actions/cache/save@d4323d4df104b026a6aa633fdb11d772146be0bf # v4.2.2
+        uses: actions/cache/save@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
         with:
           path: slack-message-timestamp.txt
           key: slack-message-timestamp-${{ github.event.pull_request.html_url }}-${{ steps.message.outputs.ts }}