fix(deps): update kotlin monorepo to v2.4.0

Author: renovate[bot]

ai-mocks-openai/samples/shadow/pom.xml

@@ -17,7 +17,7 @@
             <dependency>
                 <groupId>org.jetbrains.kotlin</groupId>
                 <artifactId>kotlin-bom</artifactId>
-                <version>2.1.21</version>
+                <version>2.4.0</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>

gradle/libs.versions.toml

@@ -12,7 +12,7 @@ google-genai = "1.55.0"
 google-adk = "1.3.0"
 junit = "6.1.0"
 kotest = "6.1.11"
-kotlin = "2.2.21"
+kotlin = "2.4.0"
 kotlinLogging = "8.0.4"
 kotlinxCoroutines = "1.11.0"
 kotlinxCollectionsImmutable = "0.4.0"