Ensure support for Python 3.13

[rikroe]

Proposed change

Enable CI for Python 3.13.

Adjust tests/requirements accordingly (fix time_machine).

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to this library)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:

Checklist

• The code change is tested and works locally.
• Tests have been added to verify that the new code works.

[rikroe]

Seems we need to update time_machine which got pinned in #570, so tests with tick=False need to be rewritten.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a1c80ca) to head (65832f6).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #669   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines         1431      1449   +18     
=========================================
+ Hits          1431      1449   +18     

Flag	Coverage Δ
3.10	?
3.11	100.00% <100.00%> (ø)
3.12	?
3.8	100.00% <100.00%> (ø)
3.9	100.00% <100.00%> (ø)

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