Bump Kotlin to v1.5.20

[schalkms]

No description provided.

[codecov]

Codecov Report

Merging #3921 (dfd2f31) into main (3056e06) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #3921      +/-   ##
============================================
- Coverage     83.59%   83.46%   -0.14%     
- Complexity     3123     3149      +26     
============================================
  Files           456      456              
  Lines          9015     9015              
  Branches       1754     1756       +2     
============================================
- Hits           7536     7524      -12     
- Misses          564      565       +1     
- Partials        915      926      +11     

Impacted Files	Coverage Δ
...ab/arturbosch/detekt/rules/bugs/MissingWhenCase.kt	88.00% <ø> (ø)
...sch/detekt/rules/coroutines/SleepInsteadOfDelay.kt	72.00% <0.00%> (-8.00%)	⬇️
...arturbosch/detekt/generator/collection/KDocTags.kt	62.50% <0.00%> (-5.00%)	⬇️
...h/detekt/rules/style/DataClassContainsFunctions.kt	95.00% <0.00%> (-5.00%)	⬇️
...rturbosch/detekt/rules/bugs/UnnecessarySafeCall.kt	73.91% <0.00%> (-4.35%)	⬇️
...io/github/detekt/report/sarif/SarifOutputReport.kt	90.90% <0.00%> (-3.04%)	⬇️
...rturbosch/detekt/rules/style/UnusedPrivateClass.kt	70.66% <0.00%> (-2.67%)	⬇️
...ekt/generator/collection/DocumentationCollector.kt	85.00% <0.00%> (-2.50%)	⬇️
...t/rules/style/UtilityClassWithPublicConstructor.kt	93.61% <0.00%> (-2.13%)	⬇️
...ain/kotlin/io/gitlab/arturbosch/detekt/cli/Spec.kt	88.23% <0.00%> (-1.97%)	⬇️

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[cortinico]

Just a small heads up: this bump is blocking a new release.
Specifically calling gw publishToMavenLocal fails with:

Caused by: kotlin.KotlinNullPointerException
        at org.jetbrains.kotlin.gradle.plugin.mpp.MppDependencyRewritingUtilsKt.associateDependenciesWithActualModuleDependencies(mppDependencyRewritingUtils.kt:188)
        at org.jetbrains.kotlin.gradle.plugin.mpp.MppDependencyRewritingUtilsKt.access$associateDependenciesWithActualModuleDependencies(mppDependencyRewritingUtils.kt:1)
        at org.jetbrains.kotlin.gradle.plugin.mpp.PomDependenciesRewriter$dependenciesMappingForEachUsageContext$2.call(mppDependencyRewritingUtils.kt:40)
        at org.jetbrains.kotlin.gradle.plugin.mpp.PomDependenciesRewriter$dependenciesMappingForEachUsageContext$2.call(mppDependencyRewritingUtils.kt:37)
        at org.gradle.api.internal.provider.DefaultProvider.calculateOwnValue(DefaultProvider.java:66)
        at org.gradle.api.internal.provider.AbstractMinimalProvider.get(AbstractMinimalProvider.java:84)
        at org.jetbrains.kotlin.gradle.utils.ProviderApiUtilsKt.getValue(providerApiUtils.kt:18)
        at org.jetbrains.kotlin.gradle.plugin.mpp.PomDependenciesRewriter.getDependenciesMappingForEachUsageContext(mppDependencyRewritingUtils.kt:37)
        at org.jetbrains.kotlin.gradle.plugin.mpp.PomDependenciesRewriter.rewritePomMppDependenciesToActualTargetModules(mppDependencyRewritingUtils.kt:73)
        at org.jetbrains.kotlin.gradle.plugin.mpp.PomDependenciesRewriter.rewritePomMppDependenciesToActualTargetModules$default(mppDependencyRewritingUtils.kt:47)
        at org.jetbrains.kotlin.gradle.plugin.AbstractKotlinPlugin$rewritePom$1.execute(KotlinPlugin.kt:424)
        at org.jetbrains.kotlin.gradle.plugin.AbstractKotlinPlugin$rewritePom$1.execute(KotlinPlugin.kt:422)
        at org.gradle.api.internal.UserCodeAction.execute(UserCodeAction.java:39)
        ... 234 more

There is already an issue reported to YouTrack: https://youtrack.jetbrains.com/issue/KT-47444
Hopefully we will see a 1.5.21 soon.

[schalkms]

Hopefully we will see a 1.5.21 soon.

Shall we leave or rollback this PR until a fix is released?

[cortinico]

Shall we leave or rollback this PR until a fix is released?

Since this is blocking the release process, I'd suggest we:

1. Revert this PR
2. Craft a 1.18.0-RC without this PR
3. Wait for 1.5.21 to release the 1.18.0 stable

According to https://youtrack.jetbrains.com/issue/KT-47444, 1.5.21 is supposed to be out in ~6 days.