CI: Add test job for Python 3.13

Python 3.13 is now in beta, thus is might be useful to start testing what works and what doesn't.

This PR adds a Python 3.13 job on Ubuntu.

Author: EwoutH

.github/workflows/build_lint.yml

@@ -33,6 +33,8 @@ jobs:
         os: [windows, ubuntu, macos]
         python-version: ["3.12"]
         include:
+          - os: ubuntu
+            python-version: "3.13"
           - os: ubuntu
             python-version: "3.11"
           - os: ubuntu
@@ -47,6 +49,7 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
+        allow-prereleases: true
         cache: 'pip'
     - name: Install uv
       run: pip install uv