Github doesn't handle snapshots well.

Hughey · Hughey · commit 62a1dc380ab3 · 2020-02-03T13:35:46.000+09:00
diff --git a/pom.xml b/pom.xml
@@ -19,7 +19,7 @@
 
     <groupId>com.google.firebase</groupId>
     <artifactId>firebase-admin</artifactId>
-    <version>6.12.3-SNAPSHOT</version>
+    <version>6.12.3</version>
     <packaging>jar</packaging>
 
     <name>firebase-admin</name>
