[image_picker]: Bump org.mockito:mockito-core (#7097)

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 4.8.0 to 5.1.1.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](https://github.com/mockito/mockito/compare/v4.8.0...v5.1.1)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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