Excavator: Upgrades Baseline to the latest version (#3011)

Author: svc-excavator-bot

build.gradle

@@ -13,9 +13,10 @@ buildscript {
         classpath 'com.palantir.javaformat:gradle-palantir-java-format:2.50.0'
         classpath 'org.revapi:gradle-revapi:1.8.0'
         classpath 'com.netflix.nebula:gradle-dependency-lock-plugin:7.0.1'
-        classpath 'com.palantir.baseline:gradle-baseline-java:6.1.0'
+        classpath 'com.palantir.baseline:gradle-baseline-java:6.13.0'
         classpath 'com.palantir.gradle.gitversion:gradle-git-version:3.1.0'
         classpath 'com.palantir.metricschema:gradle-metric-schema:0.32.0'
+        classpath 'com.palantir.suppressible-error-prone:gradle-suppressible-error-prone:2.3.0'
         classpath 'gradle.plugin.org.inferred:gradle-processors:3.7.0'
         classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:2.31.0'
     }