[Kotlin-Spring] support to Spring boot3 & jakarta extension

[jayandran-Sampath]

Updated moustache files to support jakarta extension & spring boot 3

refer https://github.com/OpenAPITools/openapi-generator/issues/13578

PR checklist

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• [x] Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
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  ./mvnw clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh
  

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[wing328]

cc @jimschubert (2017/09) ❤️, @dr4ke616 (2018/08) @karismann (2019/03) @Zomzog (2019/04) @andrewemery (2019/10) @4brunu (2019/11) @yutaka0m (2020/03)

[ravermeister]

Looking forward to 6.3.0 🙂

[varminas]

looking forward to 6.3.0

[deicon]

Any plans for this to be merged ? I have successfully tested this PR using multiple different projects. Anything missing here were I could help ?

[tuan1nguyen]

We are also looking forward to the upcoming release for migrating our Kotlin service to Spring Boot 3.

[parenko]

@jayandran-Sampath do you need some help with merging?

[Wernerson]

Also looking forward to this feature :) Any updates when this will get merged?

[jayandran-Sampath]

@jayandran-Sampath do you need some help with merging?

Hey thanks for checking.. it would be great if you or anyone else help me to resolve conflicts.. due to personal reason, i could not work on this for now.. thanks

[parenko]

Your commits are meged. I think you can close this PR.