Update plugin org.jetbrains.kotlinx.benchmark to v0.4.12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlinx.benchmark	0.4.11 -> 0.4.12

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[krzema12]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'SnakeKMP benchmarks'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.50.

Benchmark suite	Current: 4ef6cdc	Previous: ef67844	Ratio
macosX64.LoadingTimeBenchmark.loadsOpenAiSchema ( {"openAiYamlPath":"data/issues/kmp-issue-204-OpenAI-API.yaml"} )	189.81137055769233 ms/op	112.56313604782608 ms/op	1.69

This comment was automatically generated by workflow using github-action-benchmark.