Update dependency io.netty:netty-bom to v4.2.12.Final (#7403)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [io.netty:netty-bom](https://netty.io/)
([source](https://redirect.github.com/netty/netty)) | `4.2.7.Final` →
`4.2.12.Final` |
![age](https://developer.mend.io/api/mc/badges/age/maven/io.netty:netty-bom/4.2.12.Final?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/io.netty:netty-bom/4.2.7.Final/4.2.12.Final?slim=true)
|

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java/gradle/libs.versions.toml

@@ -8,7 +8,7 @@ guava = "33.5.0-jre"
 immutables = "2.12.1"
 junit-jupiter = "6.0.3"
 logback = "1.5.32"
-netty = "4.2.7.Final"
+netty = "4.2.12.Final"
 nopen = "1.0.1"
 protobuf = "4.33.5"
 slf4j = "2.0.17"