Fixing findbugs dependency

- We only depend on findbugs provided annotation at compile/runtime.

Change-Id: I7d9e677c5f110367b2dad272d6eeead46aec04d4
diff --git a/pom.xml b/pom.xml
index 14b8334..60f27a4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -662,9 +662,9 @@
       <version>2.4.1</version>
     </dependency>
     <dependency>
-      <!-- findbugs suppression annotation -->
+      <!-- findbugs suppression annotation and @GuardedBy, etc. -->
       <groupId>com.google.code.findbugs</groupId>
-      <artifactId>findbugs</artifactId>
+      <artifactId>annotations</artifactId>
       <version>${findbugs.version}</version>
     </dependency>
     <dependency>