Remove unnecessary suppression of unchecked warning

Change-Id: I47d33e98bbc1d9dcff7442b1480c2e73c308b94f

github-plugin/src/main/java/com/google/gerrit/server/account/AccountImporter.java

diff --git a/github-plugin/src/main/java/com/google/gerrit/server/account/AccountImporter.java b/github-plugin/src/main/java/com/google/gerrit/server/account/AccountImporter.java
index d98d896..44322e5 100644
--- a/github-plugin/src/main/java/com/google/gerrit/server/account/AccountImporter.java
+++ b/github-plugin/src/main/java/com/google/gerrit/server/account/AccountImporter.java
@@ -44,7 +44,6 @@
     this.schema = schema;
   }
 
-  @SuppressWarnings("unchecked")
   public Account.Id importAccount(String login, String name, String email)
       throws IOException, BadRequestException, ResourceConflictException,
       UnprocessableEntityException, OrmException {