Update kotlin to v2.1.0

[juul-mobile-bot]

This PR contains the following updates:

Package	Type	Update	Change
org.jetbrains.kotlin.plugin.serialization	plugin	minor	2.0.21 -> 2.1.0
org.jetbrains.kotlin.multiplatform	plugin	minor	2.0.21 -> 2.1.0
org.jetbrains.kotlin.js	plugin	minor	2.0.21 -> 2.1.0

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This PR has been generated by Renovate Bot.

[juul-mobile-bot]

Edited/Blocked Notification

Renovate will not automatically rebase this PR, because it does not recognize the last commit author and assumes somebody else may have edited the PR.

You can manually request rebase by checking the rebase/retry box above.

⚠️ Warning: custom changes will be lost.

[twyatt]

Blocked by KT-72883.
Should be unblocked by Kotlin 2.1.20-Beta2.