[3.14] GH-137618: Require Python 3.10 to Python 3.15 for PYTHON_FOR_REGEN (GH-137619) (#141437)

GH-137618: Require Python 3.10 to Python 3.15 for PYTHON_FOR_REGEN (GH-137619)

* Require Python 3.11 to Python 3.15 for PYTHON_FOR_REGEN

* NEWS

* keep allowing python 3.10

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(cherry picked from commit 9ce99c6c1901705238e4cb3ce81eb6f499e7b4f4)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>