gh-155732: Join the terminated process in test_repr_lock - #155734

…55734) (GH-155767)

The process was terminated, but not joined, so it was still reported as
a dangling process.
(cherry picked from commit 3c414a5)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

…nGH-155734)

The process was terminated, but not joined, so it was still reported as
a dangling process.

…55734) (GH-155768)

The process was terminated, but not joined, so it was still reported as
a dangling process.
(cherry picked from commit 3c414a5)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>