chore: release 2.2.4

2.2.3 was published with the broken installer, so it is recorded as released
rather than rewritten, and 2.2.4 is the build that can actually install itself.

2.2.4 must be sideloaded once — the fix cannot deliver itself over the path it
fixes. OTA should carry 2.2.5 onward.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/build.gradle

@@ -34,8 +34,8 @@ android {
         applicationId "com.evsuite.abrp"
         minSdk 27
         targetSdk 36
-        versionCode 19
-        versionName "2.2.2"
+        versionCode 21
+        versionName "2.2.4"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }