bruijn: remove version override

r-ryantm wasn't able to update this package automatically
because it couldn't find the version in the derivation file
(https://nixpkgs-update-logs.nix-community.org/bruijn/2026-01-05.log).

pkgs/by-name/br/bruijn/generated.nix

@@ -22,7 +22,7 @@
 }:
 mkDerivation {
   pname = "bruijn";
-  version = "0.1.0.0";
+  version = "0-unstable-2025-11-01";
   src = fetchzip {
     url = "https://github.com/marvinborner/bruijn/archive/c37a9d27b9f654b1e0118d32269a1548800b062b.tar.gz";
     sha256 = "1a667693agsc559yy4k04gxv1hlsgkn3aw64yvg876fbn5dr7sk3";

pkgs/by-name/br/bruijn/package.nix

@@ -10,8 +10,6 @@ let
   generated = haskellPackages.callPackage ./generated.nix { };
 
   overrides = {
-    version = lib.fileContents ./version.txt;
-
     passthru.updateScript = ./update.sh;
 
     description = "Purely functional programming language based on lambda calculus and de Bruijn indices";

pkgs/by-name/br/bruijn/update.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -i bash -p coreutils cabal2nix curl jq
+#!nix-shell -i bash -p coreutils cabal2nix curl jq nixfmt gnused
 
 set -euo pipefail
 
@@ -9,8 +9,9 @@ cd "$(dirname "${BASH_SOURCE[0]}")"
   < <(curl ${GITHUB_TOKEN:+-u ":$GITHUB_TOKEN"} -sfL https://api.github.com/repos/marvinborner/bruijn/branches/main \
     | jq -r '.commit | .sha, .commit.committer.date')
 
+version="0-unstable-$(date -I --date="$committer_date")"
+
 cabal2nix --maintainer defelo "https://github.com/marvinborner/bruijn/archive/${rev}.tar.gz" \
   | nixfmt \
+  | sed -E 's/\bversion = "[^"]+";/version = "'"${version}"'";/' \
   > generated.nix
-
-echo "0-unstable-$(date -I --date="$committer_date")" > version.txt

pkgs/by-name/br/bruijn/version.txt

@@ -1 +0,0 @@
-0-unstable-2025-11-01