Enable users to depend on @3 rather than pinned @3.0.0 version

[IgorMinar]

Our readme.md currently instructs users to specify full version number when installing the action:

      - name: Deploy
        uses: cloudflare/[email protected]

This means that they will forever be pinned to 3.0.0. Could we instead enable users to specify the dependency as cloudflare/wrangler-action@3 as is common in npm?

I believe this will require us to maintain and overwrite the 3 tag with every minor and patch release, similarly how actions/checkout does it: https://github.com/actions/checkout/tags (they use v prefix, so see the v3 tag).

[JacobMGEvans]

This is already possible & additionally added it to the docs https://github.com/cloudflare/wrangler-action#big-changes-in-v3

This was enabled by With these 2 PRs in for automating
This one for build & tagging for release:
#128

This one for automating the release & changelog
#132

[IgorMinar]

awesome! 🎉 Thank you