chore: update GitHub Pages workflow

Added `cancel-in-progress` to the workflow concurrency group to avoid redundant runs when new workflows are triggered. This ensures resource efficiency and smoother CI/CD operations.

(This commit message was AI-generated.)

Signed-off-by: Jens Oliver Meiert <jens@meiert.com>

Author: j9t

.github/workflows/github-pages.yml

@@ -11,6 +11,7 @@ permissions:
 
 concurrency:
   group: pages-${{ github.workflow }}-${{ github.ref_name }}
+  cancel-in-progress: true
 
 jobs:
   build: