fix(deps): update org.apache.mina to v2.2.8

Bump mina-core (test scope) from 2.2.5 to 2.2.8, the latest stable 2.x release. Verification metadata is unchanged: mina is test-only and already covered by a trusted PGP key.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: vlsi

src/bom-testing/build.gradle.kts

@@ -49,7 +49,7 @@ dependencies {
         api("org.apache.activemq:activemq-spring:6.2.6")
         api("org.apache.ftpserver:ftplet-api:1.2.1")
         api("org.apache.ftpserver:ftpserver-core:1.2.1")
-        api("org.apache.mina:mina-core:2.2.5")
+        api("org.apache.mina:mina-core:2.2.8")
         api("org.hamcrest:hamcrest-core:3.0")
         api("org.hamcrest:hamcrest-library:3.0")
         api("org.hamcrest:hamcrest:3.0")