Roll Dart Protobuf Support from 585878516d90 to 7b20134b5609 (3 revis…

…ions)

https://dart.googlesource.com/protobuf/+log/585878516d90..7b20134b5609

2022-07-07 [email protected] compile_benchmarks.dart: Remove a redundant clone
2022-07-07 [email protected] Merge protobuf_benchmarks and query_benchmark (#698)
2022-07-07 [email protected] Remove invalid Dart 2 tests (#700)

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is aware of the problem.

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Tbr: [email protected]
Change-Id: Ic6c9b47ac393a211b45a5ee5321cbfb0bfc1e05b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/250821
Commit-Queue: Nate Bosch <[email protected]>
Reviewed-by: Nate Bosch <[email protected]>

DEPS

@@ -135,7 +135,7 @@ vars = {
   "path_rev": "7a0ed40280345b1c11df4c700c71e590738f4257",
   "ply_rev": "604b32590ffad5cbb82e4afef1d305512d06ae93",
   "pool_rev": "fa84ddd0e39f45bf3f09dcc5d6b9fbdda7820fef",
-  "protobuf_rev": "585878516d90b973ba47e2ffa295814ccaa19d3d",
+  "protobuf_rev": "7b20134b5609a4d25a57c7396e91b93ba60888d5",
   "pub_rev": "9bf4289d6fd5d6872a8929d6312bbd7098f3ea9c", # manually rev'd
   "pub_semver_rev": "5c0b4bfd5ca57fe16f1319c581dc8c882e9b8cb2",
   "root_certificates_rev": "692f6d6488af68e0121317a9c2c9eb393eb0ee50",