Update dependency protoc_plugin to v25

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
protoc_plugin (source)	dev_dependencies	major	^23.0.0 -> 25.0.0

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Release Notes

google/protobuf.dart (protoc_plugin)

v25.0.0

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Note: this version requires protobuf 5.2.0.

• Handle importing well-known protos. (#​1081)

v24.0.0

Compare Source

• Breaking: Don't generate createRepeated methods.

  These methods are not too useful as there isn't much you can do with a
  PbList that you can't do with a List.

  To migrate, replace MyMessage.createRepeated() with <MyMessage>[].

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