[3.12] gh-69001: Replace maintainer email in IDLE credits (GH-129588) by miss-islington · Pull Request #129714 · python/cpython

…9588)

Instead, anyone requesting credit should submit a PR with contribution summary.
(Also fix typo in existing name.)
(cherry picked from commit 76e0182)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>