Update mockito requirement from = 1.1.0 to = 1.4.0 (#55)

Updates the requirements on [mockito](https://github.com/lipanski/mockito) to permit the latest version.
- [Release notes](https://github.com/lipanski/mockito/releases)
- [Commits](lipanski/mockito@1.1.0...1.4.0)

---
updated-dependencies:
- dependency-name: mockito
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -22,5 +22,5 @@ thiserror = "1.0"
 
 [dev-dependencies]
 assert_matches = "1.5"
-mockito = "= 1.1.0"
+mockito = "= 1.4.0"
 colored = "= 2.1.0"