Specifiy a more modern guava version in order to avoid

spotbugs/spotbugs-gradle-plugin#120

The old guava comes from https:/nebula-plugins/gradle-lint-plugin/blob/7e79f4e1f856b7cf6eebe6d86aff559702ed39e9/build.gradle#L47

build.gradle

@@ -14,6 +14,7 @@ buildscript {
  classpath "com.gradle.publish:plugin-publish-plugin:0.10.1"
  classpath "io.codearte.gradle.nexus:gradle-nexus-staging-plugin:0.20.0"
  classpath "de.marcphilipp.gradle:nexus-publish-plugin:0.2.0"
+ classpath 'com.google.guava:guava:27.1-jre'
  }
 }