Relax upper bound for `containers` to allow 0.7

[ulysses4ever]

Otherwise, LiquidHaskell can't build with GHC 9.10.

[facundominguez]

It was implemented in #41 already, but there needs to be a hackage release or a hackage revision to update the bound.

[zgrannan]

New release: https://hackage.haskell.org/package/rest-rewrite-0.4.4

@facundominguez should I add you as a maintainer on hackage so you can publish new releases yourself? If so just let me know your username

[facundominguez]

Thanks @zgrannan. I wouldn't mind publishing releases myself. My hackage username is FacundoDominguez.