chore(release): bump version to 0.2.4.6.1-alpha

Maintenance release:
- /api/v1/ingest endpoint removed on 2026-06-11; glucodroid.cloud preset
  now POSTs to /api/v1/entries (#54)
- Credential field relabeled 'Ingest token' -> 'API secret' to match
  the backend's single api_secret (#54)

Author: Rob

Common/build.gradle

@@ -89,8 +89,8 @@ android {
         //compileSdk 36
         applicationId "cloud.glucodroid"
 
-         versionName '0.2.4.6'
-        versionCode 8246
+         versionName '0.2.4.6.1-alpha'
+        versionCode 82461
 //    multiDexEnabled true
 
         buildConfigField 'String', 'BUILD_TIME', 'new java.text.SimpleDateFormat("HH:mm:ss dd-MMM-yyyy").format(new java.util.Date(' + System.currentTimeMillis() + 'L))'