Re-enable Python 3.13 smoke tests after downstream packages are updated

[MaxGhenis]

Context

PR #365 adds Python 3.13 support to policyengine-core. To resolve a circular dependency issue (also encountered in PR #338), we had to temporarily skip the smoke tests for Python 3.13 that install policyengine-us from PyPI.

The Circular Dependency

• policyengine-core needs to support Python 3.13 first
• policyengine-us (and other country packages) can't be updated until policyengine-core supports Python 3.13
• But CI fails because the smoke tests try to install policyengine-us which doesn't support Python 3.13 yet

Current Workaround

In PR #365, we modified to skip policyengine-us installation and smoke tests specifically for Python 3.13:

- name: Install -us package from PyPI
  # Skip policyengine-us installation for Python 3.13 until it's updated
  if: matrix.python-version \!= '3.13'
  run: python -m pip install policyengine-us
- name: Run smoke tests only
  # Only run smoke tests if policyengine-us was installed
  if: matrix.python-version \!= '3.13'
  run: pytest -m smoke

Tasks

After PR #365 is merged and released:

• Update policyengine-us to support Python 3.13
• Update policyengine-uk to support Python 3.13
• Update policyengine-canada to support Python 3.13
• Update other country packages to support Python 3.13
• Remove the Python 3.13 skip conditions from the smoke tests in
• Verify all smoke tests pass with Python 3.13

Related PRs

• Upgrade Python to 3.13 #365 - Initial Python 3.13 support
• Upgrade to Python 3.13 #338 - Earlier attempt that encountered the same issue