Bump io.netty:netty-bom from 4.2.10.Final to 4.2.12.Final in /lang/java (#3713)

Bumps [io.netty:netty-bom](https://github.com/netty/netty) from 4.2.10.Final to 4.2.12.Final.
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.2.10.Final...netty-4.2.12.Final)

---
updated-dependencies:
- dependency-name: io.netty:netty-bom
  dependency-version: 4.2.12.Final
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

lang/java/pom.xml

@@ -51,7 +51,7 @@
     <junit5.version>5.14.3</junit5.version>
     <maven-core.version>3.9.6</maven-core.version>
     <mockito.version>5.23.0</mockito.version>
-    <netty.version>4.2.10.Final</netty.version>
+    <netty.version>4.2.12.Final</netty.version>
     <protobuf.version>4.34.1</protobuf.version>
     <reload4j.version>1.2.26</reload4j.version>
     <servlet-api.version>4.0.1</servlet-api.version>