release: renumber crash-report release to v2.7.2

v2.7.1 is taken by the launch-crash fix (calendar observer registered before
the permission gate). Bump this held crash-reporting release to 2.7.2.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/build.gradle.kts

@@ -28,8 +28,8 @@ android {
         // the tag, with versionCode = MAJOR*10000 + MINOR*100 + PATCH
         // (e.g. v2.0.0 -> 20000). These committed values are the dev/local
         // default; keep them matching the latest released tag. See docs/RELEASING.md.
-        versionCode = 20701
-        versionName = "2.7.1"
+        versionCode = 20702
+        versionName = "2.7.2"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }