[📑 Docs]: Adapt github action tooling page for v3

[jonaslagoni]

For AsyncAPI v3, we need to adapt the github action tooling page (https://www.asyncapi.com/tools/github-actions) to usable with AsyncAPI v3.

This means we need to either:

• Adapt uses: asyncapi/[email protected] to uses: asyncapi/github-action-for-generator
• Wait for https://github.com/asyncapi/github-action-for-generator/ to release a new version where v3 is supported, and use explicit version.

Make sure you base your change on the next-major-spec branch and target it in your PR 🙂 If you have any questions, don't hesitate to ask.

[derberg]

solved with #2299
in next major branch, but considered to be fixed and closing - also for easier management of the scope for v3