Update dependency com.vanniktech:gradle-maven-publish-plugin to v0.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.vanniktech:gradle-maven-publish-plugin	0.19.0 -> 0.20.0

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Release Notes

vanniktech/gradle-maven-publish-plugin

v0.20.0

Compare Source

Upcoming behavior change

In the next release after this the com.vanniktech.maven.publish will stop adding Maven Central (Sonatype OSS) as a
publishing target and will not enable GPG signing by default. If you are curretly relying on this behavior the plugin
will print a warning during configuration phase. To continue publishing to maven central and signing artifacts either
add this to your build files:

mavenPublishing {
  publishToMavenCentral() // use publishToMavenCentral("S01") for publishing through s01.oss.sonatype.org
  enableReleaseSigning()
}

or the following to your gradle.properties:

SONATYPE_HOST=DEFAULT

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Configuration

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