Update minimum pkg:ffi version

Author: simolus3

sqlite3/pubspec.yaml

@@ -25,7 +25,7 @@ topics:
 
 dependencies:
   collection: ^1.15.0
-  ffi: '>=1.2.1 <3.0.0'
+  ffi: '^2.1.0'
   meta: ^1.3.0
   path: ^1.8.0
   web: ^1.0.0