update version attribute in gradle.properties for b2-sdk-java-private (…

…#15)

This PR updates the version attribute in gradle.properties for b2-sdk-java-private. It currently has 5.1.0-PRIVATE+01. However the Github action for the build adds the build number to the end, so the version in maven has a number such as 5.1.0-PRIVATE+01+76. So this PR removes the +01.

Testing: will view the build number after this PR is built/merged

Jira Ticket: DEV-12614

gradle.properties

@@ -1,5 +1,5 @@
-# Copyright 2021, Backblaze Inc. All Rights Reserved.
+# Copyright 2022, Backblaze Inc. All Rights Reserved.
 # License https://www.backblaze.com/using_b2_code.html
 
-version=5.1.0-PRIVATE+01
+version=5.1.0-PRIVATE
 group=com.backblaze.b2