Bump leakcanary-android from 2.5 to 2.6 in /maoni-sample

Bumps [leakcanary-android](https://github.com/square/leakcanary) from 2.5 to 2.6.
- [Release notes](https://github.com/square/leakcanary/releases)
- [Changelog](https://github.com/square/leakcanary/blob/main/docs/changelog.md)
- [Commits](square/leakcanary@v2.5...v2.6)

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

maoni-sample/build.gradle

@@ -198,7 +198,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'androidx.cardview:cardview:1.0.0'
     implementation 'com.facebook.stetho:stetho:1.5.1'
-    debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.5'
+    debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.6'
     implementation("com.mikepenz:aboutlibraries:${aboutlibraries_version}@aar") {
         transitive = true
     }