Bump openapi-generator from 6.2.0 to 6.2.1

Bumps [openapi-generator](https://github.com/openapitools/openapi-generator) from 6.2.0 to 6.2.1.
- [Release notes](https://github.com/openapitools/openapi-generator/releases)
- [Changelog](https://github.com/OpenAPITools/openapi-generator/blob/master/docs/3.0.0-release-note.md)
- [Commits](OpenAPITools/openapi-generator@v6.2.0...v6.2.1)

---
updated-dependencies:
- dependency-name: org.openapitools:openapi-generator
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

contract/build.gradle

@@ -116,5 +116,5 @@ dependencies {
     implementation "com.google.protobuf:protobuf-java:${protoVersion}"
     runtimeOnly "com.google.protobuf:protobuf-java-util:${protoVersion}"
     implementation group: 'org.apache.avro', name: 'avro', version: '1.11.1'
-    implementation 'org.openapitools:openapi-generator:6.2.0'
+    implementation 'org.openapitools:openapi-generator:6.2.1'
 }