ci: use runner ubuntu-24.04 explicitly instead of ubuntu-latest (#25)

Author: ppvg

.github/workflows/documentation-linter.yml

@@ -6,7 +6,7 @@ on:
 jobs:
   mdlint:
     name: lint markDown file
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v5
     - uses: DavidAnson/markdownlint-cli2-action@v20