Bump protobuf to 9bd149b40e3bd762d902f86a67889651bcb9486c

Changes:
```
> git log --format="%C(auto) %h %s" 7d2e615..9bd149b
 https://dart.googlesource.com/protobuf.git/+/9bd149b read from and generate grpc service metadata (991)
 https://dart.googlesource.com/protobuf.git/+/065d881 generate dartdocs for grpc services (993)
 https://dart.googlesource.com/protobuf.git/+/e2bd416 remove the api_benchmark/ package (992)
 https://dart.googlesource.com/protobuf.git/+/a6c8e56 Improve enum decoding -- alternative (981)
 https://dart.googlesource.com/protobuf.git/+/376c9ce Update README.md (990)
 https://dart.googlesource.com/protobuf.git/+/d5906e7 rev to 22.1.0 in prep for publishing (989)
 https://dart.googlesource.com/protobuf.git/+/072f99d use super params in generated grpc service classes (988)

```

Diff: https://dart.googlesource.com/protobuf.git/+/7d2e615086c973b0186802ca0b1db575d34d50ac..9bd149b40e3bd762d902f86a67889651bcb9486c/
Change-Id: Ib0586ce884c8b70301a9490e5682f19b5c27b830
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/428882
Auto-Submit: Devon Carew <[email protected]>
Reviewed-by: Konstantin Shcheglov <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: devoncarew

DEPS

@@ -139,7 +139,7 @@ vars = {
   "leak_tracker_rev": "f5620600a5ce1c44f65ddaa02001e200b096e14c", # rolled manually
   "material_color_utilities_rev": "799b6ba2f3f1c28c67cc7e0b4f18e0c7d7f3c03e",
   "native_rev": "6d51ecf34385e5872c43f1856d3fad6349200811", # rolled manually while native assets are experimental
-  "protobuf_rev": "7d2e615086c973b0186802ca0b1db575d34d50ac",
+  "protobuf_rev": "9bd149b40e3bd762d902f86a67889651bcb9486c",
   "pub_rev": "b2c03b448a47fdd52800609b9222cd737be3a934", # rolled manually
   "shelf_rev": "082d3ac2d13a98700d8148e8fad8f3e12a6fd0e1",
   "sync_http_rev": "dc54465f07d9652875deeade643256dafa2fbc6c",

pubspec.yaml

@@ -87,8 +87,7 @@ workspace:
   - tools/verify_docs
   - tools
 
-# All third_party packages here are retrieved via the DEPS-file and overridden
-# here.
+# All third_party packages are retrieved via the DEPS-file and overridden here.
 dependency_overrides:
   _experiment_sound:
     path: third_party/pkg/webdev/fixtures/_experimentSound
@@ -108,8 +107,6 @@ dependency_overrides:
     path: third_party/pkg/webdev/fixtures/_webdevSoundSmoke
   analysis_config:
     path: third_party/pkg/webdev/_analysis_config
-  api_benchmark:
-    path: third_party/pkg/protobuf/api_benchmark
   args:
     path: third_party/pkg/core/pkgs/args
   async: