fix(deps): update dependency analyzer_plugin to ^0.12.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
analyzer_plugin (source)	dependencies	minor	^0.11.3 -> ^0.12.0

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Release Notes

dart-lang/sdk (analyzer_plugin)

v0.12.0

• Breaking changes to DartFileEditBuilder: convertFunctionFromSyncToAsync
  and replaceTypeWithFuture.
• Breaking changes to all classes in lib/protocol/protocol_common.dart and
  lib/protocol/protocol_generated.dart that implement Enum: These classes
  are all now proper Dart enums. Each such enum no longer has a static VALUES
  field, no a public constructor. Each enum value also no longer has an
  instance getter, name (though the EnumName extension in dart:core
  provides a name instance getter). The instances of each enum are also now
  considered exhaustive (which may trigger new diagnostics on existing switch
  statements and switch expressions).
• Support version 7.x of the analyzer package.
• Support change descriptions on SourceEdit.
• New API in DartFileEditBuilder: getIndent, insertCaseClauseAtEnd,
  insertConstructor, insertField, insertGetter, insertMethod,
  writeIndent.
• New API in DartEditBuilder: writeFormalParameter and
  writeFormalParameters.
• New experimental API in DartEditBuilder: writeOverride2,
  writeReference2, writeType2, writeTypeParameter2, and
  writeTypeParameters2.

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