Added openapi version to the top of the spec

[seagullmouse]

• closes Put swagger version at the top of generated spec so IDE recognises swagger file #993

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[github-actions]

Hello there seagullmouse 👋

Thank you and congrats 🎉 for opening your first PR on this project.✨

We will review the following PR soon! 👀

[WoH]

LGTM, but FYI i wanna make that change in a major version just in case which is happening hopefully this weekend