master: 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

@@ -30,7 +30,7 @@
   - 24.2.1
   predecessor: "24.1"
 "24.3":
-  latest: 24.3.17
+  latest: 24.3.18
   predecessor: "24.2"
 "25.1":
   latest: 25.1.10