Upgrade to Python 3.13

[keileg]

Proposed changes

For now (and likely until the end of April), we will support Python 3.11-3.13.

Changes included:

1. All GH actions run on 3.13.
2. The base docker image is based on Python 3.13

This PR should not be merged until:

1. The GH action running all tests run successfully. EDIT: OK
2. The Docker build on Python 3.13 has been verified to work. EDIT: OK

Types of changes

What types of changes does this PR introduce to PorePy?
Put an x in the boxes that apply.

• Minor change (e.g., dependency bumps, broken links).
• Bugfix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Testing (contribution related to testing of existing or new functionality).
• Documentation (contribution related to adding, improving, or fixing documentation).
• Maintenance (e.g., improve logic and performance, remove obsolete code).
• Other: Build system

Checklist

Put an x in the boxes that apply or explain briefly why the box is not relevant.

• The documentation is up-to-date.
• Static typing is included in the update.
• This PR does not duplicate existing functionality.
• The update is covered by the test suite (including tests added in the PR).
• If new skipped tests have been introduced in this PR, pytest was run with the --run-skipped flag.

[keileg]

Tests run on 3.13 will be made required once this PR is working.

[keileg]

@IvarStefansson @jwboth: Slow tests and the Docker build were both successful, so we should be all set.

I have changed the branch protection rule to require tests to be run on Python 3.13 to make this PR pass. As a byproduct, that means that no other PRs can be merged before this one. Sorry if that comes across as extorsion.

[jwboth]

Looks good!