prepare 6.2.0 release (OpenAPITools#13514)

* set release version to 6.2.0

* update samples

* comment out rust server test in travis

6.1.0 release (OpenAPITools#13398)

Prepare 6.0.1 release (OpenAPITools#12762)

* update to v6.0.1

* update doc

* update samples

Prepare 6.0.0 release (OpenAPITools#12463)

* prepare 6.0.0 release

* update samples

* update meta codegen

Prepare 6.0.0 beta release (OpenAPITools#12039)

* update to 6.0.0-beta

* update samples

Prepare 5.4.0 release (OpenAPITools#11457)

* prepare 5.4.0 release

* update gradle tests

Prepare 5.3.1 release (OpenAPITools#11161)

* prepare v5.3.1 release

* update samples

Prepare v5.3.0 release (OpenAPITools#10680)

* prepare 5.3.0 release

* remove docker-tag-latest-release

Prepare 5.2.1 release (OpenAPITools#10161)

* prepare for 5.2.1 release

* update samples

Prepare v5.2.0 release (OpenAPITools#9920)

* 5.2.0 release

* update samples

* update meta codegen