build(deps): bump kotlin.version from 2.1.20 to 2.1.21 (#345)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -65,7 +65,7 @@
         <kafka.version>3.8.1</kafka.version>
         <kotest-assertions-core-jvm.version>5.9.1</kotest-assertions-core-jvm.version>
         <kotlin.coroutines.version>1.10.2</kotlin.coroutines.version>
-        <kotlin.version>2.1.20</kotlin.version>
+        <kotlin.version>2.1.21</kotlin.version>
         <license-maven-plugin.version>5.0.0</license-maven-plugin.version>
         <licensing-maven-plugin.version>1.7.11</licensing-maven-plugin.version>
         <licensing.prepend.text>/license/neo4j_apache_v2/notice.txt</licensing.prepend.text>