bpo-42208: GitHub Action: Add gdb to posix dependencies (GH-23043) (GH-23047)

Sort also dependencies and remove duplicates (liblzma-dev).
(cherry picked from commit 6e03c0ad156797cd6e9132e895d55dac0344d340)

Co-authored-by: Victor Stinner <vstinner@python.org>

Co-authored-by: Victor Stinner <vstinner@python.org>
1 file changed