chore: dartfn - bump http dep, drop (unused) usage dep (#459)

Author: kevmoo

dartfn/pubspec.yaml

@@ -14,10 +14,9 @@ executables:
 dependencies:
  args: ^2.1.1
  collection: ^1.15.0
- http: '>=0.13.3 <2.0.0'
+ http: ^1.0.0
  io: ^1.0.0
  path: ^1.7.0
- usage: ^4.0.2
 
 dev_dependencies:
  build: ^2.0.0