chore(deps): update dependency mockito to v5.4.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mockito	dev_dependencies	patch	5.4.2 -> 5.4.4

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Release Notes

dart-lang/mockito (mockito)

v5.4.4

• Use posix style for local imports.
• Allow test_api ^0.7.0.

v5.4.3

Compare Source

• Require analyzer 5.12.0, allow analyzer version 6.x;
• Add example of writing a class to mock function objects.
• Add support for the build_extensions build.yaml option
• Require Dart >=3.1.0.
• Potentially breaking Changed default String value returned by nice
  mocks' unstubbed method to include some useful info. This could break the
  tests that relied on getting an empty String from unstubbed methods.
• Remove deprecated returnNullOnMissingStub and OnMissingStub.returnNull
MockSpec options.

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