Increased flutter version dependency and readded safe call to overlay insert.

Author: Guldem

lib/src/presentation/authenticator_widget.dart

@@ -96,7 +96,7 @@ class _AuthenticatorWidgetState extends State<AuthenticatorWidget> {
             ),
           );
           if (!_isShowingSplashScreen) {
-            Overlay.of(context).insert(overlayEntry!);
+            Overlay.of(context)?.insert(overlayEntry!);
           }
         }
       }
@@ -105,7 +105,7 @@ class _AuthenticatorWidgetState extends State<AuthenticatorWidget> {
       setState(() {
         _isShowingSplashScreen = false;
         if (overlayEntry != null) {
-          Overlay.of(context).insert(overlayEntry!);
+          Overlay.of(context)?.insert(overlayEntry!);
         }
       });
     });

pubspec.yaml

@@ -8,7 +8,7 @@ repository: https://github.com/DutchCodingCompany/pin_lock
 
 environment:
   sdk: ">=2.12.0 <3.0.0"
-  flutter: ">=1.20.0"
+  flutter: ">=3.0.0"
 
 dependencies:
   flutter: