build(deps): bump io.netty:netty-codec-http2

Bumps [io.netty:netty-codec-http2](https://github.com/netty/netty) from 4.2.4.Final to 4.2.6.Final.
- [Commits](netty/netty@netty-4.2.4.Final...netty-4.2.6.Final)

---
updated-dependencies:
- dependency-name: io.netty:netty-codec-http2
  dependency-version: 4.2.6.Final
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle

@@ -84,7 +84,7 @@ subprojects {
             implementation("io.projectreactor.netty:reactor-netty-http:1.2.9") {
                 because("versions below 1.2.8 have security vulnerabilities including CVE-2025-22227 - see dependabot #16")
             }
-            implementation("io.netty:netty-codec-http2:4.2.4.Final") {
+            implementation("io.netty:netty-codec-http2:4.2.6.Final") {
                 because("versions below 4.1.124.Final have security vulnerabilities including CVE-2025-55163 - see dependabot #17")
             }
         }