Excavator: Update open-source publishing plugins (#399)

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Changes produced by the roomba/latest-oss-publishing check.


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build.gradle

@@ -6,7 +6,7 @@ buildscript {
 
     dependencies {
         classpath 'com.palantir.gradle.externalpublish:gradle-external-publish-plugin:1.6.0'
-        classpath 'com.gradle.publish:plugin-publish-plugin:0.18.0'
+        classpath 'com.gradle.publish:plugin-publish-plugin:0.19.0'
         classpath 'com.palantir.baseline:gradle-baseline-java:4.53.0'
         classpath 'com.palantir.gradle.conjure:gradle-conjure:5.19.0'
         classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:2.5.0'