build(amazonq): include jackson in dependency closure

With f331fb6,

we include jackson as part of core/toolkit, but not amazonq. in theory amazonq should be pulling jackson classes from core, but there appears to be a hard to reproduce edge case where a customer is hitting the same issue with jackson-kotlin deserialization

Author: rli

plugins/amazonq/build.gradle.kts

@@ -36,6 +36,7 @@ dependencies {
     implementation(project(":plugin-amazonq:codewhisperer"))
     implementation(project(":plugin-amazonq:mynah-ui"))
     implementation(project(":plugin-amazonq:shared"))
+    implementation(libs.bundles.jackson)
 
     testImplementation(project(":plugin-core"))
 }