Plugins should default to Kotlin 1.4 instead of 1.3

[larssn]

Use case

So creating a platform plugin (flutter create --org com.myorg --template=plugin --platforms=android myplugin) defaults to Kotlin 1.3.50.

Proposal

That new plugins use Kotlin 1.4, or at most, the latest version of 1.3 (1.3.72 as of writing).
But Kotlin 1.4 has a lot of neat new features and I'm not gonna list them here.

[jmagman]

\cc @xster Any idea what would need to be tested to do this?

[xster]

Should revive #59037 at some point. 1.3.50 was indeed buggy. We don't have a lot of kotlin code in our repos. Most likely will be a manual test in flutter/samples.

[larssn]

So after raising this issue, I've been testing out v1.4.10 (because the coroutine package recommends it). It's been working great and I've not run into any problems.

[stuartmorgan]

See also #78875. Based on the issue linked from there, it seems like doing this without a migration strategy for existing apps will be problematic.

[stuartmorgan]

This was fixed in #95383

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