Fix: [AEA-0000] - use latest regression test pack (#1688)

## Summary

- Routine Change

### Details

- use latest regression test pack

Author: anthony-nhs

scripts/run_regression_tests.py

@@ -13,7 +13,7 @@
 from requests.auth import HTTPBasicAuth
 
 # This should be set to a known good version of regression test repo
-REGRESSION_TESTS_REPO_TAG = "v2.0.6"
+REGRESSION_TESTS_REPO_TAG = "v2.12.6"
 
 GITHUB_API_URL = "https://api.github.com/repos/NHSDigital/electronic-prescription-service-api-regression-tests/actions"
 GITHUB_RUN_URL = "https://github.com/NHSDigital/electronic-prescription-service-api-regression-tests/actions/runs"