The `ghc-9.8` branch now includes `deepseq-1.5.0.0` (see
https://gitlab.haskell.org/ghc/ghc/-/commit/1228d3a4a08d30eaf0138a52d1be25b38339ef0b),
but many libraries' `.cabal` files only permit `deepseq < 1.5`. We add
`deepseq` to `allowNewerPkgs` in this patch so that `cabal` will ignore these
upper version bounds.