Upgrading Kotlin and Gradle

[severn-everett]

Kotlin has been upgraded to 1.9.23; Gradle has been upgraded to 8.7 and now uses checksum to verify the wrapper artifact; The Gradle files have been converted to use the Kotlin DSL

[severn-everett]

A couple of comments:

• I moved the configuration code in publish.gradle into build.gradle.kts so that all configuration code resides in that file
• If I've missed any functionality when converting the configuration code to dogfood on the Kotlin DSL, please let me know
• Likewise, I'd imagine that the required Gradle and Kotlin versions in InfraPlugin need to be upped, but I'd need some input as to what values they should be incremented to
• Using the built-in Gradle code for parsing versions was deprecated with no native replacement, so I included the Semver4J library to replace that functionality
• The semantics of the functionality to print out before a task if teamcity has been enabled has slightly changed: if there is no source set to conduct any task on (e.g. running tests), then nothing will be printed out. Might not be ideal, but at least it removed the deprecated Gradle code
• There are quite a few deprecation warnings in NativeMultiplatform.kt that I have left alone; I was planning to address them in issue Implement new way to configure targets #23, the build issue that drew me over here while I was looking to contribute to kotlinx.datetime

[ilya-g]

I wouldn't rush upgrading versions of Gradle and Kotlin here higher than those used in the libraries that use this plugin to avoid potential incompatibilities.

[severn-everett]

From what I can tell, the libraries that use this plugin are:

• kotlinx-benchmark - Kotlin 1.9.21/Gradle 7.4.2
• kotlinx-cli - Kotlin 1.9.10/Gradle 7.6.2
• kotlinx.collections.immutable - Kotlin 1.9.21/Gradle 7.4.2
• kotlin-datetime - Kotlin 1.9.21/Gradle 8.0.2

I don't think that Kotlin being at the latest minor version would affect kotlinx-cli, but I can drop Gradle to 7.6.4, given that's the greatest common major version.

EDIT: kotlinx-cli has been marked as obsolete, so that leaves the other three libraries

[ilya-g]

According to the versions above, I think it would be reasonable to use Gradle 7.4.2 and Kotlin 1.9.21.

[severn-everett]

Would I be able to get this closed soon so that I can work on the other issue I mentioned?