chore(android): bump version to 0.1.2 (versionCode 6)

Play rejects duplicate versionCodes.

First release since the workflow was pointed at the closed testing
track, so this tag doubles as the check that "alpha" is the right
track id.

android/android/app/build.gradle

@@ -7,8 +7,8 @@ android {
         applicationId "com.miti99.loto"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 5
-        versionName "0.1.1"
+        versionCode 6
+        versionName "0.1.2"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         aaptOptions {
              // Files and dirs to omit from the packaged assets dir, modified to accommodate modern web apps.