uudoc,chcon: fix needless_lifetimes warnings

[cakebaker]

This PR fixes two additional warnings from the needless_lifetimes lint. They show up when running cargo clippy --all-features --all-targets.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)

[sylvestre]

They show up when running cargo clippy --all-features --all-targets.

Means that we don't have this in the CI ?

[cakebaker]

Yes, in the CI we don't use --all-features but --features with the platform-specific features like feat_os_unix.