Chore: Bump version code and version name for 0.15.0 release

Author: thunderbiscuit

Android/app/build.gradle.kts

@@ -30,8 +30,8 @@ android {
         targetSdk = 35
         // This version code must be updated for each release but the version on the master branch
         // stays at 1.
-        versionCode = 1
-        versionName = "v0.15.0-SNAPSHOT"
+        versionCode = 26
+        versionName = "v0.15.0"
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
 
         resValue(