Update to actions/cache@v5

This is a required update, because v4 uses a deprecated node.js version.

Author: TimWolla

.github/workflows/deploy.yml

@@ -54,7 +54,7 @@ jobs:
       run: |
         pip3 install -r dconv/requirements.txt
     - name: Download the HAProxy repository cache.
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           haproxy/