CI: bump actions (nodejs deprecation)

.github/workflows/docker-tests.yml

@@ -50,7 +50,7 @@ jobs:
           cache-to: type=gha,mode=min
 
       - name: "Setup Python"
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: "3.x"
 
@@ -61,7 +61,7 @@ jobs:
 
       - name: "Cache virtualenvs"
         id: cache-pipenv
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.local/share/virtualenvs
           key: ${{ runner.os }}-pipenv-${{ hashFiles('**/Pipfile.lock') }}