chore(deps): update dependency mockito to v5.5.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mockito	dev_dependencies	minor	5.4.4 -> 5.5.0

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Release Notes

dart-lang/mockito (mockito)

v5.4.6

• When formatting a generated mocks library, use the language version of the
  library with the mockito annotation.

v5.4.5

• Ignore "must_be_immutable" warning in generated files. Mocks cannot be made
  immutable anyway, but this way users aren't prevented from using generated
  mocks altogether.
• Require Dart SDK ^3.6.0.
• Require analyzer: '>=6.9.0 <8.0.0'.
• Require dart_style: '>=2.3.7 <4.0.0', so that the current Dart language
  version can be passed to DartFormatter.
• Require source_gen: ">=1.4.0 <3.0.0".
• Add support for extension types.
• Add topics to pubspec.yaml.
• Fix a bug where type aliases in type arguments were not correctly
  resolved.
• Fix a bug where record types were not correctly resolved.

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