[ci] Update nix commit
Custom versions:
- update Alt-Ergo -> 2.4.2
- add Alt-Ergo dep: ocplib-simplex
- remove: camlzip
- remove: menhirLib
- remove: ppxlib
- remove: psmt2-frontend
Nix:
- add native inputs for Why3, AE and Bisect
Edited by Allan Blanchard
Custom versions:
Nix: