fix(ci): use subject_pattern for ADP version bump STS policy

Author: tobz

.github/chainguard/self.bump-adp-version.create-pr.sts.yaml

@@ -1,7 +1,7 @@
 # Docs: https://datadoghq.atlassian.net/wiki/spaces/SECENG/pages/5138645099/User+guide+dd-octo-sts
 issuer: https://token.actions.githubusercontent.com
 
-subject: repo:DataDog/saluki:ref:refs/tags/*
+subject_pattern: repo:DataDog/saluki:ref:refs/tags/[0-9]+\.[0-9]+\.[0-9]+
 
 claim_pattern:
   event_name: (push|workflow_dispatch)