Fix app delivery issue for iOS

ios/Flutter/AppFrameworkInfo.plist

@@ -21,6 +21,6 @@
 	<key>CFBundleVersion</key>
 	<string>1.0</string>
 	<key>MinimumOSVersion</key>
-	<string>9.0</string>
+	<string>12.0</string>
 </dict>
 </plist>

ios/Runner/Info.plist

@@ -31,6 +31,8 @@
 	<string>$(FLUTTER_BUILD_NUMBER)</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
+	<key>MinimumOSVersion</key>
+	<string>12.0</string>
 	<key>NSCameraUsageDescription</key>
 	<string>This app needs camera access to scan QR codes</string>
 	<key>UILaunchStoryboardName</key>