v5.13.0

• Capture breadcrumbs for OkHttp network requests
  #1358
  #1361
  #1363
  #1379

• Update project to build using Gradle/AGP 7
  #1354

• Increased default breadcrumb collection limit to 50
  #1366

• Support integer values in buildUuid
  #1375

• Use SystemClock.elapsedRealtime to track app.durationInForeground
  #1378