chore(deps): upgrade gapic-generator-java to 2.2.4

Google APIs · copybara-github · commit 76762cc7f564 · 2022-01-06T07:21:02.000-08:00
PiperOrigin-RevId: 420055251
diff --git a/WORKSPACE b/WORKSPACE
@@ -202,7 +202,7 @@ grpc_java_repositories()
 
 # Java microgenerator.
 # Must go AFTER java-gax, since both java gax and gapic-generator are written in java and may conflict.
-_gapic_generator_java_version = "2.2.3"
+_gapic_generator_java_version = "2.2.4"
 
 http_archive(
     name = "gapic_generator_java",
