Excavator: Upgrade buildscript dependencies (palantir#235)

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build.gradle

@@ -6,7 +6,7 @@ buildscript {
 
     dependencies {
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4'
-        classpath 'com.netflix.nebula:nebula-publishing-plugin:10.0.2'
+        classpath 'com.netflix.nebula:nebula-publishing-plugin:11.0.0'
         classpath 'com.palantir.baseline:gradle-baseline-java:0.56.0'
         classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:1.5.0'
     }