Fix octo-sts pattern

Author: aleksandr-gringauz

.github/chainguard/self.gitlab.read.sts.yaml

@@ -1,6 +1,6 @@
 issuer: https://gitlab.ddbuild.io
 
-subject_pattern: "project_path:DataDog/dd-sdk-android:ref_type:branch:ref:*"
+subject_pattern: "project_path:DataDog/dd-sdk-android:ref_type:branch:ref:.*"
 
 permissions:
   contents: read