Excavator: Format Java files (#364)

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Changes produced by the roomba/format check.


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build.gradle

@@ -11,7 +11,7 @@ buildscript {
         classpath 'com.palantir.gradle.conjure:gradle-conjure:5.18.0'
         classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:2.0.0'
         classpath 'com.palantir.gradle.gitversion:gradle-git-version:0.12.3'
-        classpath 'com.palantir.javaformat:gradle-palantir-java-format:2.5.0'
+        classpath 'com.palantir.javaformat:gradle-palantir-java-format:2.6.0'
         classpath 'gradle.plugin.org.inferred:gradle-processors:3.6.0'
     }
 }