Fix lints, tiny bump to pkg:test (#133)

lib/src/bound_multipart_stream.dart

diff --git a/lib/src/bound_multipart_stream.dart b/lib/src/bound_multipart_stream.dart
index cc01fd5..03b213b 100644
--- a/lib/src/bound_multipart_stream.dart
+++ b/lib/src/bound_multipart_stream.dart
@@ -8,7 +8,7 @@
 import 'char_code.dart' as char_code;
 import 'mime_shared.dart';
 
-/// Bytes for '()<>@,;:\\"/[]?={} \t'.
+/// Bytes for `()<>@,;:\\"/[]?={} \t`.
 const _separators = {
   40, 41, 60, 62, 64, 44, 59, 58, 92, 34, 47, 91, 93, 63, 61, 123, 125, 32, 9 //
 };
@@ -348,7 +348,6 @@
         default:
           // Should be unreachable.
           assert(false);
-          break;
       }
 
       // Move to the next byte.

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index 9e20caa..1cc38fe 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -15,4 +15,4 @@
 
 dev_dependencies:
   dart_flutter_team_lints: ^3.0.0
-  test: ^1.16.0
+  test: ^1.16.6