Add Python 3.13 compatibility

.github/workflows/test.yml

@@ -18,6 +18,9 @@ jobs:
         include:
           # The number of builds that submit code coverage configured here MUST be identical
           # to the number of `after_n_builds` in /home/bart/code/bartfeenstra/betty/codecov.yml.
+          - name: 'Python 3.13'
+            os: ubuntu-latest
+            python: '3.13.0-alpha.6'
           - name: 'Python 3.12'
             os: ubuntu-latest
             python: '3.12'
@@ -26,10 +29,10 @@ jobs:
             python: '3.11'
           - name: 'macOS'
             os: macos-latest
-            python: '3.12'
+            python: '3.13.0-alpha.6'
           - name: 'Windows'
             os: windows-latest
-            python: '3.12'
+            python: '3.13.0-alpha.6'
     timeout-minutes: 60
     steps:
       - name: Check out the source code

codecov.yml

@@ -3,4 +3,4 @@ codecov:
     # The number of builds configured here MUST be identical to the number
     # of matrix options in /.github/workflows/test.yml that submit code coverage
     # reports to Codecov.io.
-    after_n_builds: 4
+    after_n_builds: 5

pyproject.toml

@@ -47,9 +47,10 @@ classifiers = [
     'Intended Audience :: Science/Research',
     'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
     'Programming Language :: JavaScript',
+    'Programming Language :: Lua',
     'Programming Language :: Python :: 3.11',
     'Programming Language :: Python :: 3.12',
-    'Programming Language :: Lua',
+    'Programming Language :: Python :: 3.13',
     'Programming Language :: JavaScript',
     'Programming Language :: Unix Shell',
     'Operating System :: MacOS :: MacOS X',