remove dependency overrides (#13)

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index e9eca30..ff5e7c7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -15,16 +15,3 @@
   source_span: ^1.6.0
   test: ^1.12.0
   pedantic: ^1.0.0
-
-dependency_overrides:
-  # Required to get a valid pub solve until package:test updates
-  test_core:
-    git:
-      url: https://github.com/dart-lang/test.git
-      ref: drop-package-resolver
-      path: pkgs/test_core
-  test:
-    git:
-      url: https://github.com/dart-lang/test.git
-      ref: drop-package-resolver
-      path: pkgs/test