Build: Fix config syntax.

Author: scoder

pyproject.toml

@@ -4,7 +4,7 @@ requires = ["Cython>=3.1.2", "setuptools", "wheel"]
 [tool.cibuildwheel]
 build-verbosity = 2
 skip = ["pp*", "*-musllinux_i686", "cp35*", "cp36*", "cp37*"]
-enable = "cpython-freethreading cpython-prerelease"
+enable =["cpython-freethreading", "cpython-prerelease"]
 # test-command = "python -m unittest {package}/test_fractions.py -p -v"
 
 [tool.cibuildwheel.linux]