Bump org.mockito:mockito-core from 4.11.0 to 5.18.0 in /sample/android

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 4.11.0 to 5.18.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v4.11.0...v5.18.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-version: 5.18.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

sample/android/app/build.gradle

@@ -124,8 +124,8 @@ dependencies {
 
     // Test dependencies
     testImplementation "junit:junit:4.13.2"
-    testImplementation "org.mockito:mockito-core:4.11.0"
-    androidTestImplementation "org.mockito:mockito-android:4.11.0"
+    testImplementation "org.mockito:mockito-core:5.18.0"
+    androidTestImplementation "org.mockito:mockito-android:5.18.0"
     testImplementation "org.mockito:mockito-inline:4.6.1"
     testImplementation "org.assertj:assertj-core:3.27.3"
     testImplementation("com.shopify:checkout-sheet-kit:${SHOPIFY_CHECKOUT_SDK_VERSION}")