Warn/Refuse to install if ruby-lsp resolves to old versions

[Earlopain]

Description

rubocop currently has a dev dependency on the latest prism version >= 0.25 which this gem doesn't advertise support for at the moment.

During resolution, this results in a ruby-lsp version without prism as a dependency to be choosen, 0.11.2 from october last year. It seems to mostly work but obviously a bunch of stuff is missing.

[andyw8]

There should be a new release of Prism today, which will unblock this: #1913 #1953

[andyw8]

Discussed with the team today:

• We will decide on what is considered an 'old' server version, perhaps v0.12 where Prism was introduced. Over time, we may bump this to a more recent version.
• When we detect an old server version, we'll show a warning in the extension. This will link to the troubleshooting guide, in a new section explaining possible causes of the server gem being outdated (e.g. the YARP/Prism issue). There will be an option to snooze/ignore the warning.
• In the EDITORS.md doc we'll also explain the potential problem, for the benefit of those not using VS Code.

[stathis-alexander]

This is still occurring. Prism is resolving to 0.29, but ruby-lsp resolves to v11.2 because v16.6 requires prism <0.28. This is a pretty significant regression.

Can we maybe consider using pessimistic dependencies here so that new versions don't downgrade us?

s.add_dependency("prism", "~>0.23")

[andyw8]

@kddnewton confirmed the next release of Prism will be 1.0, so this will become less of a problem soon.

[Earlopain]

Noting that I ran into this again today while working on RuboCop since it aggressively keeps up with prism updates.

[andyw8]

We've updated for Prism v0.30.0, and will release shortly.

This should be the last time we run into this.

[andyw8]

Released: https://rubygems.org/gems/ruby-lsp/versions/0.17.3