Merge branch 'use_pk_task_generic_finish' into 'main'

packagekit: Use pk_task_generic_finish() for pk_task_*async() calls

Closes #2720 (closed)

See merge request !2159 (merged)

(cherry picked from commit fadf0bcc)

031ec49e packagekit: Use pk_task_generic_finish() for pk_task_*async() calls