Import 're' module in pagerduty-resolve-alert.yaml

Added import for 're' module to the workflow script.

Author: GeorgianaElena

.github/workflows/pagerduty-resolve-alert.yaml

@@ -14,6 +14,7 @@ jobs:
       shell: python
       run: |
         import os
+        import re
   
         body = """${{ github.event.issue.body }}"""
         output_file = os.getenv("GITHUB_OUTPUT")