fix: update Nix setup

.envrc

@@ -1,6 +1 @@
-# https://github.com/nix-community/nix-direnv A fast, persistent use_nix/use_flake implementation for direnv:
-if ! has nix_direnv_version || ! nix_direnv_version 2.3.0; then
-  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.3.0/direnvrc" "sha256-Dmd+j63L84wuzgyjITIfSxSD57Tx7v51DMxVZOsiUD8="
-fi
-# https://github.com/input-output-hk/devx Slightly opinionated shared GitHub Action for Cardano-Haskell projects
-use flake "github:input-output-hk/devx?rev=54ea65610338600bd4c4afd04b0b6ff612988fd4#ghc96-iog-full"
+use flake

atlas-cardano.cabal

@@ -15,7 +15,9 @@ category:           Blockchain, Cardano, Framework
 homepage:           https://github.com/geniusyield/atlas#readme
 bug-reports:        https://github.com/geniusyield/atlas/issues
 extra-source-files: README.md
-tested-with:        GHC ==9.6.5
+tested-with:
+  GHC ==9.6.5
+   || ==9.6.6
 
 source-repository head
   type:     git

cabal.project

@@ -78,6 +78,9 @@ source-repository-package
     lib/wallet-benchmarks/
     lib/wallet/
 
+package postgresql-libpq
+  flags: +use-pkg-config
+
 ------ Following is mostly from @cardano-wallet@'s @cabal.project@ file. -------
 
 --------------------------------------------------------------------------------
@@ -173,7 +176,7 @@ package cardano-node
   flags: -systemd
 
 package bitvec
-   flags: -simd
+  flags: -simd
 
 -- -------------------------------------------------------------------------
 

flake.nix

@@ -30,7 +30,7 @@
             hixProject =
               final.haskell-nix.project' {
                 src = ./.;
-                compiler-nix-name = "ghc964";
+                compiler-nix-name = "ghc966";
                 # This is used by `nix develop .` to open a shell for use with
                 # `cabal`, `hlint` and `haskell-language-server`
                 shell.tools = {