Bump `deepseq` to 1.4.7.0
Recently @bgamari forked deepseq
and pinned GHC to that fork. I propose using this version instead, and would prefer it was merged before I upload this version to Hackage.
https://github.com/haskell/deepseq/commit/895aa07175db8a55deb178e1e5b09b2e4b20f28b
(updated commit 2021-11-14)