Bump org.mockito:mockito-android from 5.18.0 to 5.20.0

Bumps [org.mockito:mockito-android](https://github.com/mockito/mockito) from 5.18.0 to 5.20.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.18.0...v5.20.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-android
  dependency-version: 5.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

rollbar-android/build.gradle.kts

@@ -37,6 +37,6 @@ dependencies {
 
     testImplementation("junit:junit:4.13.1")
     testImplementation("org.hamcrest:hamcrest-all:1.3")
-    testImplementation("org.mockito:mockito-core:5.18.0")
-    androidTestImplementation("org.mockito:mockito-android:5.18.0")
+    testImplementation("org.mockito:mockito-core:5.20.0")
+    androidTestImplementation("org.mockito:mockito-android:5.20.0")
 }