CLI: Point the update-notice to the changelog in the suggested version

[cprecioso]

Issue:

The upgrade notice when starting Storybook always points to the CHANGELOG in the next branch. However, if e.g. you're in the 6.x releases, the next branch doesn't actually have the changelog for the next 6.x release. An easy way to fix this is to always point to the CHANGELOG residing in the tag corresponding to the suggested version.

What I did

Changed next as a ref in the changelog URL to the ref of the suggested version

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

This affects the current 6.x releases, so I don't know if I should submit this PR to the main or next branch.

[ndelangen]

@kylegach could you check if this is implemented correctly? will this work? is this a good idea?

[kylegach]

So sorry for letting this sit so long! 🤦‍♂️

Thanks for catching this detail! The change is great conceptually, but needs an update in how it's executed, which I explained in my other comment.

[ndelangen]

@kylegach could to give this a review, and merge this PR of all is 👍 ?

[kylegach]

Thanks for this thoughtful fix, Carlos!