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] <[email protected]>

app/build.gradle

@@ -159,7 +159,7 @@ dependencies {
 
   implementation "dev.chrisbanes:insetter-ktx:0.3.1"
   implementation 'com.jakewharton.timber:timber:5.0.1'
-  debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.7'
+  debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.8.1'
   implementation 'com.google.firebase:firebase-crashlytics:18.2.6'
 
   testImplementation "junit:junit:${junitVersion}"