Roll Dart Protobuf Support from 7b20134b5609 to 2d6c6037cee6 (3 revisions)

https://dart.googlesource.com/protobuf/+log/7b20134b5609..2d6c6037cee6

2022-07-08 omersa@google.com Revert contructor arguments (#703)
2022-07-08 omersa@google.com Remove dart_format dep, formatting grpc files (#702)
2022-07-08 omersa@google.com Sync comment changes from internal

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Tbr: dart-ecosystem-gardener@grotations.appspotmail.com
Change-Id: I35bfa05148d56447bb92585473867c119941111e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/250883
Reviewed-by: Devon Carew <devoncarew@google.com>
Commit-Queue: Devon Carew <devoncarew@google.com>
diff --git a/DEPS b/DEPS
index e9818b9..a5ad7c5 100644
--- a/DEPS
+++ b/DEPS
@@ -135,7 +135,7 @@
   "path_rev": "7a0ed40280345b1c11df4c700c71e590738f4257",
   "ply_rev": "604b32590ffad5cbb82e4afef1d305512d06ae93",
   "pool_rev": "fa84ddd0e39f45bf3f09dcc5d6b9fbdda7820fef",
-  "protobuf_rev": "7b20134b5609a4d25a57c7396e91b93ba60888d5",
+  "protobuf_rev": "2d6c6037cee6c5f683e8f38e598443f9bec74b94",
   "pub_rev": "9bf4289d6fd5d6872a8929d6312bbd7098f3ea9c", # manually rev'd
   "pub_semver_rev": "5c0b4bfd5ca57fe16f1319c581dc8c882e9b8cb2",
   "root_certificates_rev": "692f6d6488af68e0121317a9c2c9eb393eb0ee50",