gh-136073: Fix expandvars() in Tools/freeze/checkextensions.py #136093
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* Fix potential infinite recursion and/or memory consumption.
* Fix a bug when reference can cross boundaries of substitutions, e.g.
expandvars('$a)', {'a': '$(b', 'b': 'c'}).
* Fix potential quadratic complexity.
serhiy-storchaka
added
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needs backport to 3.13
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expandvarsinTools/freeze/checkextensions.py#136073