[3.12] gh-128069: brew link --overwrite tcl-tk@8 to prevent conflict with GitHub image's version (GH-128090) (#128125)

gh-128069: brew link --overwrite tcl-tk@8 to prevent conflict with GitHub image's version (GH-128090)

brew link --overwrite tcl-tk@8 to prevent conflict with GitHub image's version
(cherry picked from commit 46dc1ba9c6e8b95635fa27607d01d6108d8f677e)

Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>