chore: ignore generated workflow lock files in dependabot

Agent-Logs-Url: https://github.com/githubnext/dependabot-campaign/sessions/7d8dc322-ec31-4741-8815-bcda2afc7ce2

Co-authored-by: mnkiefer <8320933+mnkiefer@users.noreply.github.com>

Author: Copilot

.github/dependabot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    exclude-paths:
+      - .github/workflows/*.lock.yml