deny.toml: remove redox_syscall from skip list

[cakebaker]

No description provided.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/date/resolution (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/unexpand/bounded-memory is now being skipped but was previously passing.
Congrats! The gnu test tests/cp/link-heap is now passing!
Congrats! The gnu test tests/tail/tail-n0f is now passing!