cabal.project: rm cryptohash-sha512

It is HNix-Store that requires the override, this override was used because
Store was not released, and we needed to override both Store-{Core,Remote) and
their use of `cryptohash-sha512` for their override builds.

Author: Anton-Latukha

cabal.project

@@ -1,8 +1,2 @@
 packages:
   ./hnix.cabal
-
-source-repository-package
-    type: git
-    location: https://github.com/Anton-Latukha/cryptohash-sha512
-    tag: 48f827eb09a73ad5ee43dd397a06ebdbf51ab856
-