Build 3.14 wheels for testing (#1345)

* Build 3.14 wheels for testing
* use cibuildwheel 3

Author: zsol

.github/workflows/build.yml

@@ -42,8 +42,11 @@ jobs:
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
         run: >-
           echo LIBCST_NO_LOCAL_SCHEME=1 >> $GITHUB_ENV
+      - name: Enable building wheels for pre-release CPython versions
+        if: github.event_name != 'release'
+        run: echo CIBW_ENABLE=cpython-prerelease >> $GITHUB_ENV
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.23.3
+        uses: pypa/cibuildwheel@v3.0.0b2
       - uses: actions/upload-artifact@v4
         with:
           path: wheelhouse/*.whl