Fix maven publishing

[phinner]

Switching to Gradle 9 broke maven publishing due to the use of an incompatible version of the Kotlin plugin.
The outdated version tries to use a removed method on project dependencies.
See the following when trying to run ":core:publishToMavenLocal --stacktrace":

Caused by: java.lang.NoSuchMethodError: 'org.gradle.api.Project org.gradle.api.artifacts.ProjectDependency.getDependencyProject()'
	at org.jetbrains.kotlin.gradle.plugin.mpp.publishing.DeprecatedPomDependenciesRewriter.associateDependenciesWithActualModuleDependencies(DeprecatedPomDependenciesRewriter.kt:88)
	at org.jetbrains.kotlin.gradle.plugin.mpp.publishing.DeprecatedPomDependenciesRewriter.access$associateDependenciesWithActualModuleDependencies(DeprecatedPomDependenciesRewriter.kt:26)
	at org.jetbrains.kotlin.gradle.plugin.mpp.publishing.DeprecatedPomDependenciesRewriter$dependenciesMappingForEachUsageContext$2.call(DeprecatedPomDependenciesRewriter.kt:45)
	at org.jetbrains.kotlin.gradle.plugin.mpp.publishing.DeprecatedPomDependenciesRewriter$dependenciesMappingForEachUsageContext$2.call(DeprecatedPomDependenciesRewriter.kt:40)
	at org.gradle.api.internal.provider.DefaultProvider.calculateOwnValue(DefaultProvider.java:73)
        (And some more...)

This PR fixes this by updating said plugin to the latest version.

https://kotlinlang.org/docs/multiplatform/multiplatform-compatibility-guide.html#version-compatibility

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