ci: remove PYTHON_GIL=1 var

Author: paultiq

.github/workflows/packaging_wheels.yml

@@ -94,9 +94,6 @@ jobs:
         env:
           CIBW_ARCHS: ${{ matrix.platform.arch == 'amd64' && 'AMD64' || matrix.platform.arch }}
           CIBW_BUILD: ${{ matrix.python }}-${{ matrix.platform.cibw_system }}_${{ matrix.platform.arch }}
-          # PYTHON_GIL=1: Suppresses the RuntimeWarning that the GIL is enabled on free-threaded builds. 
-          # TODO: Remove PYTHON_GIL=1 when free-threaded is supported. 
-          CIBW_ENVIRONMENT: PYTHON_GIL=1
       - name: Upload wheel
         uses: actions/upload-artifact@v4
         with: