chore(deps): Bump leakcanary-android from 2.7 to 2.8.1

Bumps [leakcanary-android](https://github.com/square/leakcanary) from 2.7 to 2.8.1.
- [Release notes](https://github.com/square/leakcanary/releases)
- [Changelog](https://github.com/square/leakcanary/blob/main/docs/changelog.md)
- [Commits](square/leakcanary@v2.7...v2.8.1)

---
updated-dependencies:
- dependency-name: com.squareup.leakcanary:leakcanary-android
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

maoni-sample/build.gradle

@@ -197,7 +197,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.3.1'
     implementation 'androidx.cardview:cardview:1.0.0'
     implementation 'com.facebook.stetho:stetho:1.6.0'
-    debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.7'
+    debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.8.1'
     implementation("com.mikepenz:aboutlibraries:${aboutlibraries_version}@aar") {
         transitive = true
     }