fix(bulk-cdk): Add checkout step to detect-changes job in Dokka workflow (#69806)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.github/workflows/kotlin-bulk-cdk-dokka-publish.yml

@@ -22,6 +22,11 @@ jobs:
     name: Detect Kotlin Bulk CDK Changes
     runs-on: ubuntu-24.04
     steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
       - name: Detect Changes
         id: detect-changes
         uses: dorny/paths-filter@v3.0.2