[webview]: Bump mockito-inline

Bumps [mockito-inline](https://github.com/mockito/mockito) from 4.8.0 to 5.1.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v4.8.0...v5.1.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

packages/webview_flutter/webview_flutter_android/android/build.gradle

@@ -39,7 +39,7 @@ android {
         implementation 'androidx.annotation:annotation:1.5.0'
         implementation 'androidx.webkit:webkit:1.5.0'
         testImplementation 'junit:junit:4.13.2'
-        testImplementation 'org.mockito:mockito-inline:4.8.0'
+        testImplementation 'org.mockito:mockito-inline:5.1.0'
         testImplementation 'androidx.test:core:1.3.0'
     }