Update dependencies, Bump version number

pubspec.yaml

@@ -2,7 +2,7 @@ name: font_awesome_flutter
 description: The Font Awesome Icon pack available as Flutter Icons. Provides 1500 additional icons to use in your apps.
 maintainer: Michael Spiss (@michaelspiss)
 homepage: https://github.com/fluttercommunity/font_awesome_flutter
-version: 9.0.0
+version: 9.1.0
 
 environment:
   sdk: ">=2.12.0 <3.0.0"
@@ -12,7 +12,7 @@ dependencies:
     sdk: flutter
 
 dev_dependencies:
-  recase: ^4.0.0-nullsafety
+  recase: ^4.0.0
   flutter_test:
     sdk: flutter
   version: ^2.0.0