Bump protobuf and protoc_plugin

[dependabot]

Bumps protobuf and protoc_plugin. These dependencies needed to be updated together.
Updates protobuf from 2.1.0 to 3.0.0

Release notes

Sourced from protobuf's releases.

protobuf-3.0.0

• Require Dart 2.19.
• Remove ReadonlyMessageMixin (#183, #644)
• Remove frozenMessageModificationHandler (#175, #643)
• Remove PbListBase and FrozenPbList types. All proto repeated fields now use PbList. To check if a list is frozen, use isFrozen getter. (#624, #626)
• Initialize map fields in GeneratedMessage.getField. This behavior is consistent with getField called on repeated fields. (#373, #707)
• Remove unused and optional PbMap constructor argument BuilderInfo? info. ([d94d3f0])
• UnknownFieldSetField methods hasRequiredFields, isInitialized and getter length removed. (#721)
• Update library documentation to hide internals, add documentation for public types. (#681)
• Fix PbMap._isReadonly field initialization in PbMap.unmodifiable. (#741, #754)
• Fix decoding map fields when key or value (or both) fields of a map entry is missing. (#719, #745)
• Fix updating frozen (immutable) messages with merge methods (mergeFromBuffer, mergeFromProto3Json, ...). (#489, #727)
• Fix handling null values in proto3 JSON deserializer. (#751, #760, #763)
• Fix handling negative JSON values when parsing uint32 fields. (#839)
• Avoid serializing unknown fields twice in reparseMessage. (#840)

#183: google/protobuf.dart#183 #644: google/protobuf.dart#644 #175: google/protobuf.dart#175 #643: google/protobuf.dart#643 #624: google/protobuf.dart#624 #626: google/protobuf.dart#626 #373: google/protobuf.dart#373 #707: google/protobuf.dart#707 [d94d3f0]: google/protobuf.dart@d94d3f0 #721: google/protobuf.dart#721 #681: google/protobuf.dart#681 #741: google/protobuf.dart#741 #719: google/protobuf.dart#719 #745: google/protobuf.dart#745 #489: google/protobuf.dart#489 #727: google/protobuf.dart#727 #751: google/protobuf.dart#751 #760: google/protobuf.dart#760 #763: google/protobuf.dart#763 #754: google/protobuf.dart#754 #839: google/protobuf.dart#839 #840: google/protobuf.dart#840

Commits

• a9bf79f Release protobuf-3.0.0, protoc_plugin-21.0.0 (#843)
• 6f3fc90 More simplifications, add an argument type (#842)
• 831003b Minor refactoring in ExtensionRegistry.getExtension (#841)
• 0d820ef Avoid serializing unknown fields twice in reparseMessage (#840)
• edf8e92 Fix parsing negative JSON values for uint32 fields (#839)
• 2931b2e Add PR links to recent CHANGELOG entries (#838)
• da6953c Update to latest lints and Dart SDK (#828)
• 346a72d Fix generated ignore_for_file directives (#833)
• 35ea45f Latest mono_repo (#834)
• 7d2d293 Sync some g3 changes, minor refactoring (#832)
• Additional commits viewable in compare view

Updates protoc_plugin from 20.0.1 to 21.0.0

Release notes

Sourced from protoc_plugin's releases.

protoc_plugin-21.0.0

• Identifiers fromBuffer, fromJson, $_defaultFor, initByValue are no longer reserved. Proto fields with those Dart names will no longer have a suffix added. (#679)

• Remove message constructor arguments. Constructors with arguments cause increase in release binary sizes even when no arguments are passed to the constructors. (#703)

  Migration:

  Set the fields after construction, using cascade syntax. For example, if you have:

  MyMessage(a: 123, b: [1, 2, 3])

  You can do:

  MyMessage()
    ..a = 123
    ..b.addAll([1, 2, 3])

• Require Dart 2.19.

• Export public dependencies (import publics in proto files) in .pbenum.dart files, same as .pb.dart files. ([9aad6aa])

• Fix decoding map fields when key or value (or both) fields of a map entry is missing. (#719, #745)

• Generated files now split ignore_for_file comments across multiple lines when necessary. (#770)

• Generated files now uses shared consts to eliminate repeated bool.fromEnvironment() expressions. (#772)

• Removed accidental /// at the top of generated Dart files to avoid new dangling_library_doc_comments lint. (#774)

• Generated files now have sorted imports and have fewer import-related ignore_for_file: analysis directives. (#778)

• Remove duplicated consts in generated files. (#773)

#679: google/protobuf.dart#679 #703: google/protobuf.dart#703 [9aad6aa]: https://github.com/google/protobuf.dart/commits/9aad6aa #719: google/protobuf.dart#719 #745: google/protobuf.dart#745 #770: google/protobuf.dart#770 #772: google/protobuf.dart#772 #773: google/protobuf.dart#773 #774: google/protobuf.dart#774 #778: google/protobuf.dart#778

Commits

• a9bf79f Release protobuf-3.0.0, protoc_plugin-21.0.0 (#843)
• 6f3fc90 More simplifications, add an argument type (#842)
• 831003b Minor refactoring in ExtensionRegistry.getExtension (#841)
• 0d820ef Avoid serializing unknown fields twice in reparseMessage (#840)
• edf8e92 Fix parsing negative JSON values for uint32 fields (#839)
• 2931b2e Add PR links to recent CHANGELOG entries (#838)
• da6953c Update to latest lints and Dart SDK (#828)
• 346a72d Fix generated ignore_for_file directives (#833)
• 35ea45f Latest mono_repo (#834)
• 7d2d293 Sync some g3 changes, minor refactoring (#832)
• Additional commits viewable in compare view

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