Fix request body regex in Python compilecheck
Fix request body regex in Python compilecheck

saicheems/discovery-artifact-manager,googleapis/discovery-artifact-manager,saicheems/discovery-artifact-manager,saicheems/discovery-artifact-manager,googleapis/discovery-artifact-manager,saicheems/discovery-artifact-manager,saicheems/discovery-artifact-manager,saicheems/discovery-artifact-manager,saicheems/discovery-artifact-manager,googleapis/discovery-artifact-manager,googleapis/discovery-artifact-manager,googleapis/discovery-artifact-manager,saicheems/discovery-artifact-manager,googleapis/discovery-artifact-manager