[3.11] gh-85567: Fix resouce warnings in pickle and pickletools CLIs (GH-113618) (GH-113759)

Explicitly open and close files instead of using FileType.
(cherry picked from commit bd754b93ca837aa1f239252437a211271d068b71)

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