This copies commit 2a4862a (fixup! indent: only reset some options when
has vim9, 2024-01-31) from https://github.com/benknoble/vim-racket and
fixes 26b0176a9 (runtime(racket): undo some indent options only when
vim9script is available (#13935), 2024-01-30).
Signed-off-by: D. Ben Knoble <ben.knoble+github@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>