Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/publish.yaml

@@ -16,7 +16,7 @@ jobs:
       url: https://wiki.leighhack.org
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
            fetch-depth: 0
       - uses: actions/setup-python@v5

.github/workflows/tests.yaml

@@ -10,7 +10,7 @@
       build:
         runs-on: ubuntu-latest
         steps:
-          - uses: actions/checkout@v4
+          - uses: actions/checkout@v5
             with:
                fetch-depth: 0
           - uses: actions/setup-python@v5