update version to 5.5.3

Author: tibbi

app/build.gradle

@@ -15,8 +15,8 @@ android {
         applicationId "com.simplemobiletools.flashlight"
         minSdkVersion 21
         targetSdkVersion 30
-        versionCode 50
-        versionName "5.5.2"
+        versionCode 51
+        versionName "5.5.3"
         setProperty("archivesBaseName", "flashlight")
     }