Bump org.jetbrains.kotlin:kotlin-maven-plugin from 2.2.10 to 2.2.21

Bumps org.jetbrains.kotlin:kotlin-maven-plugin from 2.2.10 to 2.2.21.

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-maven-plugin
  dependency-version: 2.2.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

openpdf-kotlin/pom.xml

@@ -43,7 +43,7 @@
       <plugin>
         <groupId>org.jetbrains.kotlin</groupId>
         <artifactId>kotlin-maven-plugin</artifactId>
-        <version>2.2.10</version>
+        <version>2.2.21</version>
         <executions>
           <execution>
             <id>compile</id>