chore(deps): update dependency gts to v6

Author: renovate-bot

package.json

@@ -43,7 +43,7 @@
     "google-protobuf": "^3.17.1",
     "grpc": "^1.24.10",
     "grpc-tools": "^1.11.1",
-    "gts": "^3.1.0",
+    "gts": "^6.0.0",
     "mocha": "^9.2.2",
     "typescript": "^4.3.2"
   },