chore(deps): bump org.jetbrains.kotlin:kotlin-maven-allopen from 2.2.20 to 2.2.21 (#201)

Author: dependabot[bot]

kotlin-asyncapi-examples/kotlin-asyncapi-spring-boot-example/pom.xml

@@ -17,7 +17,7 @@
 
 	<properties>
 		<java.version>17</java.version>
-		<kotlin.version>2.2.20</kotlin.version>
+		<kotlin.version>2.2.21</kotlin.version>
 		<spring-boot.version>3.5.7</spring-boot.version>
 		<main.class>com.asyncapi.kotlinasyncapi.example.spring.ExampleApplicationKt</main.class>
 	</properties>