Fix Python 3.13 compatibility (issue #2794)

- Update Python version constraint from '>=3.10,<3.13' to '>=3.10,<3.14' in all relevant files
- Add test to verify Python version compatibility
- Update GitHub Actions workflow to include Python 3.13 testing
- Add Docker test to verify installation on Python 3.13

Co-Authored-By: Joe Moura <joao@crewai.com>

Dockerfile.test

@@ -0,0 +1,14 @@
+FROM python:3.13-slim-bookworm
+
+WORKDIR /app
+
+RUN pip install --upgrade pip
+
+# Copy the current directory contents into the container
+COPY . /app/
+
+# Install the package
+RUN pip install -e .
+
+# Test importing the package
+CMD ["python", "-c", "import crewai; print(f'Successfully imported crewai version {crewai.__version__}')"]