bpo-18049: Sync thread stack size to main thread size on macOS (GH-14748)

bpo-18049: Sync thread stack size to main thread size on macOS (GH-14748)

This changeset increases the default size of the stack
for threads on macOS to the size of the stack
of the main thread and reenables the relevant
recursion test.
(cherry picked from commit 1a057bab0f18d6ad843ce321d1d77a4819497ae4)

Co-authored-by: Ronald Oussoren <ronaldoussoren@mac.com>