ahuston-0 c845b6b500 adjust ERROR_PR_ALREADY_EXISTS based on updated failure message
Uses below error message as a basis:

Create or update the pull request
Attempting creation of pull request
::error::pull request already exists for these targets [id: 30, issue_id: 27, head_repo_id: 1, base_repo_id: 1, head_branch: update-flake-lock, base_branch: main]
2025-06-08 00:00:53 +00:00
..
2024-01-31 11:06:34 +00:00
2024-09-03 08:54:12 +01:00