Update pyproject.toml: remove duplicate line

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: deruyter92

pyproject.toml

@@ -51,7 +51,6 @@ tf = [
     "tensorflow>=2.12.0,<2.13; platform_system == 'Linux' and python_version >= '3.11'",
     "tensorflow-macos>=2.7.0,<2.12; platform_system == 'Darwin' and python_version < '3.11'",
     "tensorflow-macos>=2.12.0,<2.13; platform_system == 'Darwin' and python_version >= '3.11'",
-    "tensorflow-io-gcs-filesystem; platform_system != 'Darwin'",
     # Tensorflow is not supported on Windows with Python >= 3.11
     "tensorflow>=2.7,<=2.10; platform_system == 'Windows' and python_version < '3.11'",
     "tensorflow-io-gcs-filesystem==0.27; platform_system == 'Windows' and python_version < '3.11'",