Update kotlin monorepo to v1.9.21

Author: renovate[bot]

pom.xml

@@ -27,7 +27,7 @@
     <properties>
         <java.version>11</java.version>
         <assertj-core.version>3.24.2</assertj-core.version>
-        <kotlin-stdlib.version>1.9.10</kotlin-stdlib.version>
+        <kotlin-stdlib.version>1.9.21</kotlin-stdlib.version>
         <arrow-core.version>1.2.1</arrow-core.version>
         <junit-jupiter.version>5.10.0</junit-jupiter.version>
         <dokka-maven-plugin.version>1.9.0</dokka-maven-plugin.version>