fix up 3.14 support

Author: blink1073

.github/workflows/test-python.yml

@@ -43,7 +43,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.9", "3.13", "3.14"]
+        python-version: ["3.9", "3.13", "3.14t"]
 
     steps:
       - uses: actions/checkout@v4
@@ -57,6 +57,9 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Build and test dist files
         run: |
+          if [ "${{ matrix.python-version }}" == "3.14" ]; then 
+            export PIP_PRE=1
+          fi
           export LIBMONGOCRYPT_VERSION=$(cat ./scripts/libmongocrypt-version.txt)
           git fetch origin $LIBMONGOCRYPT_VERSION
           bash ./scripts/release.sh

bindings/python/.evergreen/test.sh

@@ -76,7 +76,7 @@ for PYTHON_BINARY in "${PYTHONS[@]}"; do
     $PYTHON_BINARY -c 'import sys; print(sys.version)'
     git clean -dffx
     createvirtualenv $PYTHON_BINARY .venv
-    python -m pip install --prefer-binary -v -e ".[test]"
+    python -m pip install --prefer-binary -v -e ".[test]" || python -m pip install --pre --prefer-binary -v -e ".[test]"
     echo "Running tests with crypto enabled libmongocrypt..."
     PYMONGOCRYPT_LIB=$PYMONGOCRYPT_LIB_CRYPTO python -c 'from pymongocrypt.binding import lib;assert lib.mongocrypt_is_crypto_available(), "mongocrypt_is_crypto_available() returned False"'
     PYMONGOCRYPT_LIB=$PYMONGOCRYPT_LIB_CRYPTO python -m pytest -v --ignore=test/performance .

bindings/python/requirements.txt

@@ -1,5 +1,4 @@
-cffi>=1.12.0,<3;python_version<"3.14"
-cffi>=2.0.0b1,<3;python_version=="3.14"
+cffi>=1.12.0,<3
 cryptography>=40
 packaging>=21.0
 httpx>=0.25.0