chore(cli): Migrate task updates kotlin version in root build.gradle

[OS-pedrogustavobilro]

PR description

This PR updates the migrate.ts task to detect if the project's root build.gradle file has Kotlin defined (either via kotlin_version variable or set in the kotlin gradle plugin), and if so, update it to match the Kotlin version that Capacitor 8 uses (2.2.0).

Testing

Here's a few examples of the command running (it was run before to make the other Cap 8 changes, so you'll only see the kotlin version change in diff):

• Project with kotlin_version variable
• Project with version explicitly in gradle plugin

You can test yourself by checking this branch, and mapping the cli version to the local source code directory (make sure you run build in cli directory beforehand), then run npx cap migrate on the app.

If you want to run a second time in the same app, you'll need to manually change the version for cli every time, because the migrate command will change the versions of capacitor next. If you're running the migrate command a second time, you can avoid running npm install (replying n to the second question), to not override the cli version afterwards (core and android and ios should already be using next from running migrate the first time, so nothing should change).

[jcesarmobile]

Would be good to check the existing value so we don't downgrade it if set to 2.2.21 or greater, like we do for other variables, i.e

capacitor/cli/src/tasks/migrate.ts

Line 486 in e8507cf

if (gte(neededDeps[dep], existingVersion)) {

[OS-pedrogustavobilro]

Would be good to check the existing value so we don't downgrade it if set to 2.2.21 or greater

@jcesarmobile Done in 43860fc. I extracted some logic to a separate method, basically to replace kotlin_version and/or (most likely just or, but in theory could be both) gradle plugin.

Let me know what you think