Revert "Point GKEHub Membership API to v1beta as v1beta1 will be deprecated soon #16950" (#9846) (#6882)

[upstream:ff9f783e20a7fb922821ca066557fcc1bcc30104]

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/9846.txt

@@ -0,0 +1,2 @@
+```release-note:none
+```

google-beta/transport/config.go

@@ -530,7 +530,7 @@ var DefaultBasePaths = map[string]string{
 	FirebaseStorageBasePathKey:          "https://firebasestorage.googleapis.com/v1beta/",
 	FirestoreBasePathKey:                "https://firestore.googleapis.com/v1/",
 	GKEBackupBasePathKey:                "https://gkebackup.googleapis.com/v1/",
-	GKEHubBasePathKey:                   "https://gkehub.googleapis.com/v1beta/",
+	GKEHubBasePathKey:                   "https://gkehub.googleapis.com/v1beta1/",
 	GKEHub2BasePathKey:                  "https://gkehub.googleapis.com/v1beta/",
 	GkeonpremBasePathKey:                "https://gkeonprem.googleapis.com/v1/",
 	HealthcareBasePathKey:               "https://healthcare.googleapis.com/v1beta1/",