Excavator: Update open-source publishing plugins (#2516)

Author: svc-excavator-bot

build.gradle

@@ -11,7 +11,7 @@ buildscript {
         classpath 'com.palantir.gradle.jdks:gradle-jdks:0.31.0'
         classpath 'com.palantir.gradle.jdkslatest:gradle-jdks-latest:0.7.0'
         classpath 'com.diffplug.gradle:goomph:3.32.1'
-        classpath 'com.palantir.gradle.externalpublish:gradle-external-publish-plugin:1.11.0'
+        classpath 'com.palantir.gradle.externalpublish:gradle-external-publish-plugin:1.12.0'
         classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:2.11.0'
         classpath 'com.gradle.publish:plugin-publish-plugin:1.1.0'
         classpath 'com.palantir.baseline:gradle-baseline-java:4.190.0'