Bump reactor-grpc-stub from 1.2.2 to 1.2.3 (hashgraph#2648)

Bumps reactor-grpc-stub from 1.2.2 to 1.2.3.

---
updated-dependencies:
- dependency-name: com.salesforce.servicelibs:reactor-grpc-stub
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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hedera-mirror-protobuf/pom.xml

@@ -16,7 +16,7 @@
 
     <properties>
         <protobuf.plugin.version>0.6.1</protobuf.plugin.version>
-        <reactor-grpc.version>1.2.2</reactor-grpc.version>
+        <reactor-grpc.version>1.2.3</reactor-grpc.version>
     </properties>
 
     <dependencies>