Bump minSdk version to 23

22 is under 0.5% of users

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

build.gradle

@@ -120,7 +120,7 @@ android {
     compileSdkVersion 29
 
     defaultConfig {
-        minSdkVersion 22
+        minSdkVersion 23
         targetSdkVersion 29
 
         // arguments to be passed to functional tests