Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -40,7 +40,7 @@ jobs:
             tag_suffix: ''
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dorny/paths-filter@v3
         id: filter
         with: