[chore] Release 8.2.0 (#683)

- Deprecated support for Java 7. Instead use Java 8 or higher when deploying the Admin SDK. Java 7 support will be dropped in the next major version.

Author: lahirumaramba

Diff for: pom.xml

@@ -19,7 +19,7 @@
 
     <groupId>com.google.firebase</groupId>
     <artifactId>firebase-admin</artifactId>
-    <version>8.1.0</version>
+    <version>8.2.0</version>
     <packaging>jar</packaging>
 
     <name>firebase-admin</name>