- try to use cffi prerelease

.github/workflows/tests.yml

@@ -153,8 +153,7 @@ jobs:
  run: |
  pip install -U pip
  pip install -U "setuptools<69" wheel twine
- # Remove this hack once 'cffi' has a release supporting Python 3.13.
- pip install -e "git+https://github.com/python-cffi/cffi.git#egg=cffi"
+ pip install --pre cffi
  - name: Install Build Dependencies
  if: matrix.python-version != '3.13'
  run: |
@@ -323,8 +322,7 @@ jobs:
  if: matrix.python-version == '3.13'
  run: |
  pip install -U wheel "setuptools<69"
- # Remove this hack once 'cffi' has a release supporting Python 3.13.
- pip install -e "git+https://github.com/python-cffi/cffi.git#egg=cffi"
+ pip install --pre cffi
  # coverage might have a wheel on PyPI for a future python version which is
  # not ABI compatible with the current one, so build it from sdist:
  pip install -U --no-binary :all: coverage