Update dependency com.vanniktech.maven.publish to v0.28.0

[slack-oss-bot]

This PR contains the following updates:

Package	Type	Update	Change
com.vanniktech.maven.publish	plugin	minor	0.27.0 -> 0.28.0

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Release Notes

vanniktech/gradle-maven-publish-plugin (com.vanniktech.maven.publish)

v0.28.0

Compare Source

• Added support for publishing through the new Central Portal. To use
  this use the CENTRAL_PORTAL option when specifying the Sonatype host.
• For Kotlin Multiplatform the main plugin will now automatically publish the
  release variant if the project has an Android target and no variant was explicitly
  specified through the Kotlin Gradle DSL.
• Support specifying the Android variants to publish in KotlinMultiplatform(...).
• Updated minimum supported Gradle, Android Gradle Plugin and Kotlin versions.
• Removed support for the deprecated Kotlin/JS plugin.
• Removed the deprecated closeAndReleaseRepository task. Use releaseRepository, which
  is functionally equivalent, instead.

Minimum supported versions

• JDK 11
• Gradle 8.1
• Android Gradle Plugin 8.0.0
• Kotlin Gradle Plugin 1.9.20

Compatibility tested up to

• JDK 21
• Gradle 8.6
• Gradle 8.7-rc-3
• Android Gradle Plugin 8.3.0
• Android Gradle Plugin 8.4.0-alpha13
• Kotlin Gradle Plugin 1.9.23
• Kotlin Gradle Plugin 2.0.0-Beta4

Configuration cache status

Configuration cache is generally supported, except for:

• Publishing releases to Maven Central (snapshots are fine), blocked by Gradle issue #​22779.
• Dokka does not support configuration cache

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