chore(deps): bump org.jetbrains.kotlin:kotlin-maven-allopen

Bumps org.jetbrains.kotlin:kotlin-maven-allopen from 2.2.21 to 2.3.21.

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-maven-allopen
  dependency-version: 2.3.21
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

boot-kotlin/pom.xml

@@ -23,7 +23,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>21</java.version>
-        <kotlin.version>2.2.21</kotlin.version>
+        <kotlin.version>2.3.21</kotlin.version>
     </properties>
 
     <dependencies>