Fix Nomulus build by adding explicit error-prone dependency

The bazel build was failing with the following error message without it:

error: cannot access CanIgnoreReturnValue
  class file for com.google.errorprone.annotations.CanIgnoreReturnValue not found

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=143961684

java/google/registry/repositories.bzl

@@ -926,6 +926,9 @@ def com_google_guava():
           "http://maven.ibiblio.org/maven2/com/google/guava/guava/20.0/guava-20.0.jar",
       ],
       licenses = ["notice"],  # The Apache Software License, Version 2.0
+      deps = [
+          "@com_google_errorprone_error_prone_annotations",
+      ],
   )
 
 def com_google_guava_testlib():