Bump version to 3.15.7-beta and update fastlane metadata

Signed-off-by: openhab-bot <bot@openhab.org>

fastlane/metadata/android/bg-BG/full_description.txt

@@ -1,7 +1,7 @@
 openHAB – „овластяване на интелигентния дом“ – домашна автоматизация с отворен код, независим от определен доставчик и технология
 
  Вместо това известията се анкетират редовно в тези компилации.
-Опитай нови функции и дайте ранна обратна връзка!
+Опитай нови функции и дай ранна обратна връзка!
 Може да инсталираш бета версията паралелно със <a href="https://f-droid.org/packages/org.openhab.habdroid/">стабилната версия</a>.
 
 openHAB е основана на Java платформа за домашна автоматизация с отворен код, която интегрира и комбинира широк набор от различни интелигентни домашни системи и технологии в една програма.

fastlane/metadata/android/en-US/changelogs/550.txt

@@ -0,0 +1,9 @@
+## What's Changed
+* Drop support for openHAB 1 by @mueller-ma in https://github.com/openhab/openhab-android/pull/3725
+* Fix handling of multiple buttons with different visibility in the same spot by @jimtng in https://github.com/openhab/openhab-android/pull/3784
+* Fix Buttons not showing when the Buttongrid is inside a Frame by @jimtng in https://github.com/openhab/openhab-android/pull/3783
+* Fix Buttongrid's layout changes when there is an invisible button by @jimtng in https://github.com/openhab/openhab-android/pull/3782
+* Fix stateFromLabel when label contains square brackets in pattern by @jimtng in https://github.com/openhab/openhab-android/pull/3770
+
+
+**Full Changelog**: https://github.com/openhab/openhab-android/compare/3.15.6-beta...3.15.7-beta

mobile/build.gradle

@@ -49,8 +49,8 @@ android {
         minSdkVersion 21
         compileSdk 34
         targetSdkVersion 33
-        versionCode 549
-        versionName "3.15.6-beta"
+        versionCode 550
+        versionName "3.15.7-beta"
         multiDexEnabled true
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         buildConfigField "long", "TIMESTAMP", System.currentTimeMillis() + "L"