Update dependency org.jetbrains.kotlin:kotlin-maven-allopen to v2.2.21 (#190)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -18,7 +18,7 @@
 
 	<properties>
 		<java.version>17</java.version>
-		<kotlin.version>2.2.20</kotlin.version>
+		<kotlin.version>2.2.21</kotlin.version>
 		<testcontainers.version>1.21.3</testcontainers.version>
 		<sonar.projectKey>piomin_course-kubernetes-microservices</sonar.projectKey>
 		<sonar.organization>piomin</sonar.organization>