Bump actions/checkout from 4 to 5 (#70)

Author: dependabot[bot]

.github/workflows/test.yml

@@ -63,7 +63,7 @@ jobs:
         use_lua: yes
     - name: Install apt dependencies.
       run: sudo apt-get install -y lua-json
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         submodules: recursive
     - name: Install haproxy-lua-http globally.