v3.12.13
[3.12] gh-67877: Fix memory leaks in terminated RE matching (GH-126840) (GH-126961)
gh-91524: Speed up the regular expression substitution (#91525)
[3.12] gh-101955: Fix SystemError in possesive quantifier with alternative and group (GH-111362) (GH-126963)
gh-97669: Create Tools/build/ directory (#97963)