Upgrade to os-platform-finder 1.2.1

Refs Graylog2/graylog2-server#1737

Author: Jochen Schalanda

pom.xml

@@ -84,7 +84,7 @@
         <dependency>
             <groupId>org.graylog.repackaged</groupId>
             <artifactId>os-platform-finder</artifactId>
-            <version>1.0</version>
+            <version>1.2.1</version>
         </dependency>
         <dependency>
             <groupId>com.google.auto.value</groupId>