chore(bazel): update rules_gapic to v0.5.5.

Google APIs · copybara-github · commit 2d5f6e5a41ab · 2021-06-16T15:32:57.000-07:00
* stop generating `protoc-gen-docs_plugin` with `py_proto_library`

PiperOrigin-RevId: 379825239
diff --git a/WORKSPACE b/WORKSPACE
@@ -128,7 +128,7 @@ go_register_toolchains()
 
 gazelle_dependencies()
 
-_rules_gapic_version = "0.5.4"
+_rules_gapic_version = "0.5.5"
 
 http_archive(
     name = "rules_gapic",
