Merge pull request #96 from Metaswitch/renovate/actions-checkout-7.x

Update actions/checkout action to v7

Author: maxdymond

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
       matrix:
         python-version: ["3.11"]
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with: