Update dependency mockito to v5.4.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mockito	dev_dependencies	patch	5.4.2 -> 5.4.5

---

Release Notes

dart-lang/mockito (mockito)

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.

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.

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.