RATIS-1303. Upgrade Ratis Thirdparty to 0.6.0 (#412)

diff --git a/pom.xml b/pom.xml
index 9828d3f..db4814e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -223,7 +223,7 @@
     <maven.min.version>3.3.9</maven.min.version>
 
     <!-- Contains all shaded thirdparty dependencies -->
-    <ratis.thirdparty.version>0.6.0-SNAPSHOT</ratis.thirdparty.version>
+    <ratis.thirdparty.version>0.6.0</ratis.thirdparty.version>
 
     <!-- Need these for the protobuf compiler. *MUST* match what is in ratis-thirdparty -->
     <shaded.protobuf.version>3.11.0</shaded.protobuf.version>