release-25.3: Update pkg/testutils/release/cockroach_releases.yaml

Update pkg/testutils/release/cockroach_releases.yaml with recent values.

Epic: None
Release note: None
Release justification: test-only updates

Author: cockroach-teamcity

pkg/testutils/release/cockroach_releases.yaml

@@ -19,7 +19,7 @@
   - 23.1.0
   predecessor: "22.2"
 "23.2":
-  latest: 23.2.27
+  latest: 23.2.28
   predecessor: "23.1"
 "24.1":
   latest: 24.1.23