Updated specmatic-grpc version to 0.1.31

Author: specmatic-builder

src/constants/specmatic-versions.json

@@ -7,7 +7,7 @@
   "specmatic-openapi-version": "1.25.4",
   "specmatic-jdbc-version": "0.12.2",
   "specmatic-redis-version": "0.9.6",
-  "specmatic-grpc-version": "0.1.30",
+  "specmatic-grpc-version": "0.1.31",
   "specmatic-graphql-version": "1.5.10",
   "specmatic-arazzo-version": "1.6.4",
   "specmatic-google-pubsub-version": "0.6.1",