Excavator: Upgrades Baseline to the latest version (#1522)

Author: svc-excavator-bot

build.gradle

@@ -29,7 +29,7 @@ buildscript {
         classpath 'com.palantir.javaformat:gradle-palantir-java-format:2.73.0'
         classpath 'com.palantir.suppressible-error-prone:gradle-suppressible-error-prone:2.16.0'
         classpath 'gradle.plugin.com.github.jengelman.gradle.plugins:shadow:7.0.0'
-        classpath 'com.palantir.baseline:gradle-baseline-java:6.55.0'
+        classpath 'com.palantir.baseline:gradle-baseline-java:6.56.0'
         classpath 'com.palantir.gradle.gitversion:gradle-git-version:4.0.0'
         classpath 'com.palantir.gradle.idea-configuration:gradle-idea-configuration:0.5.0'
         classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:3.2.0'