chore(deps): bump com.android.tools.build:gradle in /app

Bumps com.android.tools.build:gradle from 7.4.2 to 8.1.2.

---
updated-dependencies:
- dependency-name: com.android.tools.build:gradle
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

app/build.gradle

@@ -5,7 +5,7 @@ buildscript {
         maven { url 'https://jitpack.io' }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.4.2'
+        classpath 'com.android.tools.build:gradle:8.1.2'
         classpath 'com.github.bjoernq:unmockplugin:0.7.9'
     }
 }