Upgrade several AndroidX Libraries.

AppCompat 1.2.0 to 1.5.1
Lifecycle 2.3.1 to 2.5.1
Navigation 2.3.5 to 2.5.2
Fragment 1.3.5 to 1.5.2
Annotations 1.2.0 to 1.4.0
Window 1.0.0-alpha09 to 1.0.0
AAPT2 to 7.0.4
Fragment-Testing 1.3.5 to 1.5.2 (matching Fragment)

app/src/main/java/org/thoughtcrime/securesms/util/LocaleUtil.kt

@@ -25,7 +25,7 @@ object LocaleUtil {
     }
 
     for (index in 0 until localeList.size()) {
-      locales += localeList.get(index)
+      locales += localeList.get(index) ?: continue
     }
 
     return locales