chore(deps): Bump io.netty:netty-bom

Bumps [io.netty:netty-bom](https://github.com/netty/netty) from 4.2.6.Final to 4.2.8.Final.
- [Commits](netty/netty@netty-4.2.6.Final...netty-4.2.8.Final)

---
updated-dependencies:
- dependency-name: io.netty:netty-bom
  dependency-version: 4.2.8.Final
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pbj-core/hiero-dependency-versions/build.gradle.kts

@@ -9,7 +9,7 @@ val protobuf = "4.31.1"
 val junit5 = "5.13.4"
 val mockito = "5.20.0"
 
-dependencies { api(platform("io.netty:netty-bom:4.2.6.Final")) }
+dependencies { api(platform("io.netty:netty-bom:4.2.8.Final")) }
 
 dependencies.constraints {
     api("org.antlr:antlr4-runtime:$antlr") { because("org.antlr.antlr4.runtime") }