Update dependency build to v2 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
build	dependencies	major	^1.2.2 -> ^2.0.0

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Release Notes

dart-lang/build

v2.3.1

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• Allow the latest package:analyzer.
• Bump min sdk to 2.17.0.

v2.3.0

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• Support ^ in build extensions that don't use capture groups, which results
  in full path matching instead of suffix matching.

v2.2.2

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• Allow analyzer version 4.x.

v2.2.1

• Fix a bug where builders were allowed to write to the same asset multiple
  times.

v2.2.0

• Allow reusing the values held by Resources when the resource has a dispose
  method. Previously the instances were discarded and recreated for every build
  even if they had tried to clean up their own state.
• Allow the latest analyzer.

v2.1.1

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• Throw an ArgumentError if an expected output matches the input.
• Bump min sdk to 2.14.0.

v2.1.0

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• Expand the expressiveness of buildExtensions include capture groups,
  enabling directory moves. For more information on this feature, see
  capture groups
• Add an allowedOutputs getter to BuildStep. It returns assets that may be
  written in that step.

v2.0.3

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• Allow analyzer version 2.x.x.

v2.0.2

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• Handle failed resolvers in buildStep.complete.

v2.0.1

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• Require package:async version 2.5.0 and package:collection version 1.15.0.

v2.0.0

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• Migrate to null-safety
• Breaking: Remove the deprecated rootPackage argument to runBuilder
• Breaking: Change the first argument to AssetId.resolve from a String
  (which previously was required to be a valid URI) to a Uri instance. Call
  sites which have static errors can wrap the argument with Uri.parse().

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