Bump helidon.version from 4.2.2 to 4.2.3 in /java (#310)

Bumps `helidon.version` from 4.2.2 to 4.2.3.

Updates `io.helidon.microprofile.grpc:helidon-microprofile-grpc-client` from 4.2.2 to 4.2.3

Updates `io.helidon.http.media:helidon-http-media-jsonb` from 4.2.2 to 4.2.3

Updates `io.helidon.http.media:helidon-http-media-jsonp` from 4.2.2 to 4.2.3

---
updated-dependencies:
- dependency-name: io.helidon.microprofile.grpc:helidon-microprofile-grpc-client
  dependency-version: 4.2.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: io.helidon.http.media:helidon-http-media-jsonb
  dependency-version: 4.2.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: io.helidon.http.media:helidon-http-media-jsonp
  dependency-version: 4.2.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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java/helidon-client/pom.xml

@@ -100,7 +100,7 @@
     <coherence.groupId>com.oracle.coherence.ce</coherence.groupId>
     <coherence.version>${project.version}</coherence.version>
 
-    <helidon.version>4.2.2</helidon.version>
+    <helidon.version>4.2.3</helidon.version>
 
     <netty.version>4.1.118.Final</netty.version>
   </properties>