fix(sdk): Reduce min sdk again and update dots_indicator lib for same reason

Author: Pyozer

example/pubspec.yaml

@@ -4,7 +4,7 @@ publish_to: 'none'
 version: 1.0.0+1
 
 environment:
-  sdk: ^3.5.4
+  sdk: ">=2.17.0 <4.0.0"
 
 dependencies:
   flutter:

pubspec.yaml

@@ -5,14 +5,14 @@ repository: https://github.com/pyozer/introduction_screen
 issue_tracker: https://github.com/pyozer/introduction_screen/issues
 
 environment:
-  sdk: ">=2.12.0 <4.0.0"
+  sdk: ">=2.17.0 <4.0.0"
 
 dependencies:
   flutter:
     sdk: flutter
 
   collection: ^1.18.0
-  dots_indicator: ^4.0.0
+  dots_indicator: ^4.0.1
   flutter_keyboard_visibility: ^6.0.0
 
 dev_dependencies: