Install Python 3.13 for drivers-evergreen-tools GH action

Related to mongodb/mongo-php-library#1564

Author: jmikola

.github/workflows/tests.yml

@@ -53,6 +53,10 @@ jobs:
         with:
           submodules: true
 
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+
       - id: setup-mongodb
         uses: mongodb-labs/drivers-evergreen-tools@master
         with: