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

Bumps org.jetbrains.kotlin:kotlin-maven-allopen from 1.9.20 to 1.9.21.

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

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

kofu-reactive-mongo/pom.xml

@@ -17,7 +17,7 @@
 
     <properties>
         <java.version>17</java.version>
-        <kotlin.version>1.9.20</kotlin.version>
+        <kotlin.version>1.9.21</kotlin.version>
         <spring-fu.version>0.5.1</spring-fu.version>
     </properties>