Upgrade Clang-Format check in GitHub Action.

The previous GitHub Action (`RafikFarhad/clang-format-github-action`)
was not handling deeply nested files correctly: formatting was not
enforced in a second directory level or deeper.

A more popular action (`jidicula/clang-format-action`) is now used,
which enables Clang-Format 18.

.github/workflows/build.yml

@@ -10,14 +10,14 @@ on:
 
 jobs:
   clang-format-check:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     name: Clang-Format Check
     steps:
       - uses: actions/checkout@v4
-      - uses: RafikFarhad/clang-format-github-action@v4
+      - uses: jidicula/clang-format-action@v4.13.0
         with:
-          style: "file"
-          sources: "Source/**/*.h,Source/**/*.cpp"
+          clang-format-version: '18'
+          check-path: Source
 
   build-windows:
     runs-on: windows-latest