build(deps): bump io.netty dependency set in /server (#1724)

Bumps `io.netty` dependency set from 4.2.7.Final to 4.2.12.Final.

Updates `io.netty:netty-codec-http` from 4.2.7.Final to 4.2.12.Final
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.2.7.Final...netty-4.2.12.Final)

Updates `io.netty:netty-codec` from 4.2.7.Final to 4.2.12.Final
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.2.7.Final...netty-4.2.12.Final)

Updates `io.netty:netty-handler` from 4.2.7.Final to 4.2.12.Final
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.2.7.Final...netty-4.2.12.Final)

Updates `io.netty:netty-buffer` from 4.2.7.Final to 4.2.12.Final
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.2.7.Final...netty-4.2.12.Final)

Updates `io.netty:netty-transport` from 4.2.7.Final to 4.2.12.Final
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.2.7.Final...netty-4.2.12.Final)

Updates `io.netty:netty-common` from 4.2.7.Final to 4.2.12.Final
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.2.7.Final...netty-4.2.12.Final)

Updates `io.netty:netty-transport-native-epoll` from 4.2.7.Final to 4.2.12.Final
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.2.7.Final...netty-4.2.12.Final)

---
updated-dependencies:
- dependency-name: io.netty:netty-codec-http
  dependency-version: 4.2.12.Final
  dependency-type: direct:production
- dependency-name: io.netty:netty-codec
  dependency-version: 4.2.12.Final
  dependency-type: direct:production
- dependency-name: io.netty:netty-handler
  dependency-version: 4.2.12.Final
  dependency-type: direct:production
- dependency-name: io.netty:netty-buffer
  dependency-version: 4.2.12.Final
  dependency-type: direct:production
- dependency-name: io.netty:netty-transport
  dependency-version: 4.2.12.Final
  dependency-type: direct:production
- dependency-name: io.netty:netty-common
  dependency-version: 4.2.12.Final
  dependency-type: direct:production
- dependency-name: io.netty:netty-transport-native-epoll
  dependency-version: 4.2.12.Final
  dependency-type: direct:production
...

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

Author: dependabot[bot]

server/build.gradle

@@ -53,7 +53,7 @@ configurations {
 dependencyManagement {
     gatling {
         dependencies {
-            dependencySet(group: 'io.netty', version: '4.2.7.Final') {
+            dependencySet(group: 'io.netty', version: '4.2.12.Final') {
                 entry 'netty-codec-http'
                 entry 'netty-codec'
                 entry 'netty-handler'