Bump protobuf from 5.1.0 to 6.0.0 in the pub group

[dependabot]

Bumps the pub group with 1 update: protobuf.

Updates protobuf from 5.1.0 to 6.0.0

Release notes

Sourced from protobuf's releases.

package:protobuf v6.0.0

• New GeneratedMessage extension methods toTextFormat and writeTextFormat added to convert the message into the official protocol buffers text format. (#1080, #125)

• Add [well-known proto types][wkts] as libraries. This change is required for protoc_plugin-25.0.0. (#1081)

• Breaking: Hide PbList and PbMap constructors. It is not possible to construct these values correctly in user code, so the constructors are now private. Existing uses of PbList can be replaced by List and PbMap can be replaced by Map.

  For immutable lists and maps, you can use built_value. (#1072)

• Map fields now check key and value validity when adding elements. (#1065, #1076)

#1080: google/protobuf.dart#1080 #125: google/protobuf.dart#125 [wkts]: https://protobuf.dev/reference/protobuf/google.protobuf #1081: google/protobuf.dart#1081 #1072: google/protobuf.dart#1072 #1065: google/protobuf.dart#1065 #1076: google/protobuf.dart#1076

Commits

• 9e30258 Check key and value validity in PbMap (#1076)
• cafeac4 Hide PbList and PbMap constructors (#1072)
• 7fcd48b Sync some of the internal changes (#1084)
• 3ed04a9 Add well-known type support (#1081)
• a1dceed protoc_plugin refactors (#1082)
• 46c3697 Update test protos copied from C++ protobuf (#1079)
• b98d4e2 Implement proto text format generator (#1080)
• See full diff in compare view

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[rmconsole-wf]

+1 from RM