Remove deprecated python-freethreading option

Mirrors matplotlib/matplotlib#32022

Also 3.14 is no longer prerelease, so don't enable that option either

Author: ksunden

.github/workflows/wheels.yml

@@ -173,7 +173,6 @@ jobs:
           package-dir: dist/${{ needs.build_sdist.outputs.SDIST_NAME }}
         env:
           CIBW_BUILD: "cp314-* cp314t-*"
-          CIBW_ENABLE: "cpython-freethreading cpython-prerelease"
           CIBW_ARCHS: ${{ matrix.cibw_archs }}
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux_2_28
 
@@ -183,7 +182,6 @@ jobs:
           package-dir: dist/${{ needs.build_sdist.outputs.SDIST_NAME }}
         env:
           CIBW_BUILD: "cp313-* cp313t-*"
-          CIBW_ENABLE: cpython-freethreading
           CIBW_ARCHS: ${{ matrix.cibw_archs }}
 
       - name: Build wheels for CPython 3.12