Add concurrency control to GitHub Actions workflows

Added concurrency groups to "bump-version-preview" and "publish-docs" workflows to prevent overlapping runs. This ensures cleaner and more reliable workflow executions by canceling redundant jobs.

Author: coordt

.github/workflows/bump-version-preview.yaml

@@ -1,9 +1,12 @@
 name: Display version hint
+
 on:
   pull_request:
     types: [synchronize, opened, reopened, ready_for_review]
     branches: [master]
 
+concurrency: version-preview-${{ github.ref }}
+
 jobs:
   preview-version:
     runs-on: ubuntu-latest

.github/workflows/publish-docs.yaml

@@ -1,5 +1,7 @@
 name: Publish Final Documentation
 
+concurrency: docs
+
 on:
   push:
     branches: [$default-branch]