ci: explicitly use python3 to start goma (#39655)

ci: explicitly use python3 to start goma (#39650)

* ci: explicitly use python3 to start goma

* ci: explicitly use python3 for goma

(cherry picked from commit 83760bd5

)

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: John Kleinschmidt <jkleinsc@electronjs.org>