support and test on Python 3.13

[ThomasWaldmann]

Fixes #8599.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.54%. Comparing base (4f794bb) to head (69151c7).
Report is 5 commits behind head on 1.4-maint.

Additional details and impacted files

@@            Coverage Diff             @@
##           1.4-maint    #8600   +/-   ##
==========================================
  Coverage      82.54%   82.54%           
==========================================
  Files             38       38           
  Lines          11090    11096    +6     
  Branches        1717     1718    +1     
==========================================
+ Hits            9154     9159    +5     
- Misses          1377     1379    +2     
+ Partials         559      558    -1     

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