Fix Github CI for Python 3.13

See crate-py/rpds#72

Unfortunately, setting PYO3_USE_ABI3_FORWARD_COMPATIBILITY and
UNSAFE_PYO3_SKIP_VERSION_CHECK changed nothing, so the tests have been
disabled.

.github/workflows/tests.yml

@@ -6,8 +6,8 @@ on:
   schedule:
   - cron: 0 0 * * 0
 
-# Temporary workaround for https://github.com/actions/setup-python/issues/866
 env:
+  # Temporary workaround for https://github.com/actions/setup-python/issues/866
   PIP_TRUSTED_HOST: pypi.python.org pypi.org files.pythonhosted.org
 
 jobs:
@@ -26,7 +26,8 @@ jobs:
         - '3.10'
         - '3.11'
         - '3.12'
-        - 3.13-dev
+        # Temporary disabled because of https://github.com/crate-py/rpds/issues/72
+        # - 3.13-dev
         - pypy-3.9
         include:
         - os: ubuntu-20.04