fix lints absed on dep upgrades

app/lib/core/uuid.dart

@@ -21,4 +21,4 @@ import 'package:uuid/data.dart';
 import 'package:uuid/rng.dart';
 import 'package:uuid/uuid.dart';
 
-final uuid = Uuid(goptions: GlobalOptions(CryptoRNG()));
+const uuid = Uuid(goptions: GlobalOptions(CryptoRNG()));

app/lib/extensions/http_encoding.dart

@@ -20,7 +20,6 @@
 import 'dart:convert';
 
 import 'package:http/http.dart';
-import 'package:http_parser/http_parser.dart';
 
 /// This is modified from default latin1 fallback to use utf8
 Encoding _encodingForHeaders(Map<String, String> headers) =>