Update upgrading section

[mlvandijk]

🤔 What's the problem you're trying to solve?

Currently trying to upgrade from info.cukes 1.2.5 to cucumber-jvm latest (or as close as I can get).
The list of blog posts announcing new versions is a helpful guide to incremental upgrading.

✨ What's your proposed solution?

Add missing blog posts from v4.2.0 to v7.0.0 to page https://cucumber.io/docs/guides/upgrading/

e.g. https://cucumber.io/blog/open-source/announcing-cucumber-jvm-5-0-0/
https://github.com/cucumber/cucumber-jvm/tree/main/release-notes

⛏Have you considered any alternatives or workarounds?

Additional context

This is also a note to self ;) I may as well update the page while working on this.

[mpkorstanje]

All the blog posts are in git. Too much of a hassle to blog now that its all smart bear.

https://github.com/cucumber/cucumber-jvm/tree/main/release-notes

[mpkorstanje]

So maybe you can replace the links to the blog posts with links to git.