Move to Flutter 3.47, use the improvements that come with this (#64)

Reviewed-on: #64

lib/widgets/divider_text.dart

@@ -1,11 +1,8 @@
-import "package:flutter/material.dart";
+import "package:material_ui/material_ui.dart";
 import "package:nexus/widgets/divider_widget.dart";
 
-class DividerText extends StatelessWidget {
-  final String text;
-
-  const DividerText(this.text, {super.key});
-
+final class const DividerText(final String text, {super.key})
+    extends StatelessWidget {
   @override
   Widget build(BuildContext context) =>
       DividerWidget(Text(text, style: Theme.of(context).textTheme.labelLarge));