Bump kotlin.version from 2.2.20 to 2.2.21 in /ship-backend (#197)

Bumps `kotlin.version` from 2.2.20 to 2.2.21.

Updates `org.jetbrains.kotlin:kotlin-maven-allopen` from 2.2.20 to 2.2.21

Updates `org.jetbrains.kotlin:kotlin-maven-noarg` from 2.2.20 to 2.2.21

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

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

Author: dependabot[bot]

ship-backend/pom.xml

@@ -26,7 +26,7 @@
 
 	<properties>
 		<java.version>17</java.version>
-		<kotlin.version>2.2.20</kotlin.version>
+		<kotlin.version>2.2.21</kotlin.version>
 		<minio.version>8.6.0</minio.version>
 	</properties>