[PR #12885/a4e40bcf backport][8.3.x] Fix pdb selftests on Python 3.13 #12887
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This is a backport of PR #12885 as merged into main (a4e40bc).
Python 3.13 makes pdb break on the breakpoint() call, rather than on the next line:
https://docs.python.org/3/whatsnew/3.13.html#pdb
Also runs the pdb tests on Python 3.13 in CI.
See #12884 for a more proper solution for that.
Fixes #12497