Combine Future Kotlin Renovate PRs

[CodingDepot]

This PR adds a new group to the renovate packageRules that matches the package prefixes org.jetbrains.kotlin:kotlin- and org.jetbrains.kotlin.plugin..

This aims to prevent situations such as with #889 and #890 or also #866 and #867, where two independent PRs are made to update the main Kotlin packages and the serialization plugin, but both PRs contain identical changes anyways.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.20%. Comparing base (332baee) to head (b5e8280).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #891   +/-   ##
=========================================
  Coverage     77.20%   77.20%           
  Complexity      250      250           
=========================================
  Files            59       59           
  Lines          1882     1882           
  Branches        265      265           
=========================================
  Hits           1453     1453           
  Misses          308      308           
  Partials        121      121           

Flag	Coverage Δ
unittests	77.20% <ø> (ø)

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[fwendland]

The Kotlin monorepo from Renovate should actually combine all of them 🤔 (cf. https://docs.renovatebot.com/presets-monorepo/#monorepokotlin). All of these PRs are updating the same element of our gradle/libs.versions.toml, too. I'm guessing the plugins are released slightly delayed from the remaining Kotlin packages. I would still assume that Renovate combines them.

Can you check upstreams or issues/discussions before we start changing (a supposedly) working configuration?