promote agnhost to v2.52

Signed-off-by: Daman Arora <[email protected]>

Author: aroradaman

test/utils/image/manifest.go

@@ -228,7 +228,7 @@ const (
 
 func initImageConfigs(list RegistryList) (map[ImageID]Config, map[ImageID]Config) {
 	configs := map[ImageID]Config{}
-	configs[Agnhost] = Config{list.PromoterE2eRegistry, "agnhost", "2.51"}
+	configs[Agnhost] = Config{list.PromoterE2eRegistry, "agnhost", "2.52"}
 	configs[AgnhostPrivate] = Config{list.PrivateRegistry, "agnhost", "2.6"}
 	configs[AuthenticatedAlpine] = Config{list.GcAuthenticatedRegistry, "alpine", "3.7"}
 	configs[AuthenticatedWindowsNanoServer] = Config{list.GcAuthenticatedRegistry, "windows-nanoserver", "v1"}