Bump nixpkgs

[smatting]

Motivated by #4220

Checklist

• Add a new entry in an appropriate subdirectory of changelog.d
• Read and follow the PR guidelines

[smatting]

Building of hoogle docs fails because of

hoogle> Using Parsec parser
hoogle> Configuring hoogle-5.0.18.4...
hoogle> CallStack (from HasCallStack):
hoogle>   withMetadata, called at libraries/Cabal/Cabal/src/Distribution/Simple/Utils.hs:368:14 in Cabal-3.10.3.0:Distribution.Simple.Utils
hoogle> Error: Setup: Encountered missing or private dependencies:
hoogle> crypton-connection ==0.3.2

The application however builds

[MangoIV]

we're good, I think