Show minimum version in update dialog

[omar-o22]

Summary

Displays the minimum required client version in the update dialog when a user tries joins a server with a higher minclientversion.

Motivation

Sometimes users update failures, displaying the required client version helps anyone assisting them identify which version is needed, so it can be installed manually.

Test plan

1. Connect to a server with a higher minclientversion than the client.

Checklist

• Your code should follow the coding guidelines.
• Smaller pull requests are easier to review. If your pull request is beefy, your pull request should be reviewable commit-by-commit.