build(deps): upgrade Flutter package dependencies

scripts/codegen.sh

@@ -12,4 +12,4 @@ dart run scripts/generate_hid_key_labels.dart
 dart run scripts/generate_iso_639_data.dart
 python3 scripts/generate_relay_protocol.py
 dart run slang
-dart run build_runner build --delete-conflicting-outputs "$@"
+dart run build_runner build "$@"

scripts/test_check_codegen.py

@@ -250,7 +250,7 @@ esac
             self.assertEqual((self.root / relative).read_text(encoding="utf-8"), "version two\n")
         self.assertEqual(
             (self.root / "build-runner-args.txt").read_text(encoding="utf-8"),
-            "run build_runner build --delete-conflicting-outputs --build-filter=lib/models/**\n",
+            "run build_runner build --build-filter=lib/models/**\n",
         )