fix: re-add support for openapi-typescript 5 and 6

[mattmess1221]

🔗 Linked issue

Allows a workaround for #72

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation, readme or JSDoc annotations)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

In my opinion, openapi-typescript 7 is not ready. This PR fixes support for and allows openapi-typescript 5 and 6 via peer dependency.

📝 Checklist

• [x] I have linked an issue or discussion.
• [ ] I have updated the documentation accordingly.

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[johannschopplich]

Thanks. Yes, throwing out the other versions was a bit too hasty.