Excavator: Upgrades Baseline to the latest version (#713)

Author: svc-excavator-bot

build.gradle

@@ -26,12 +26,13 @@ buildscript {
         classpath 'com.palantir.gradle.jdks:gradle-jdks:0.48.0'
         classpath 'com.palantir.gradle.jdkslatest:gradle-jdks-latest:0.13.0'
         classpath 'com.gradle.publish:plugin-publish-plugin:1.3.0'
-        classpath 'com.palantir.baseline:gradle-baseline-java:5.61.0'
+        classpath 'com.palantir.baseline:gradle-baseline-java:6.9.0'
         classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:2.25.0'
         classpath 'com.palantir.gradle.externalpublish:gradle-external-publish-plugin:1.19.0'
         classpath 'com.palantir.gradle.failure-reports:gradle-failure-reports:1.13.0'
         classpath 'com.palantir.gradle.gitversion:gradle-git-version:3.1.0'
         classpath 'com.palantir.javaformat:gradle-palantir-java-format:2.42.0'
+        classpath 'com.palantir.suppressible-error-prone:gradle-suppressible-error-prone:1.8.0'
         classpath 'gradle.plugin.org.inferred:gradle-processors:3.7.0'
     }
 }

src/main/java/com/palantir/gradle/graal/Platform.java

@@ -33,6 +33,7 @@ public enum Architecture {
     }
 
     public static OperatingSystem operatingSystem() {
+        @SuppressWarnings("for-rollout:StringCaseLocaleUsage")
         String os = System.getProperty("os.name").toLowerCase();
         if (os.contains("mac")) {
             return OperatingSystem.MAC;