Merge pull request #150202 from cockroach-teamcity/crdb-releases-yaml-update-release-24.3

Author: rail

pkg/testutils/release/cockroach_releases.yaml

@@ -39,5 +39,5 @@
   latest: 25.2.2
   predecessor: "25.1"
 "25.3":
-  latest: 25.3.0-beta.2
+  latest: 25.3.0-beta.3
   predecessor: "25.2"