fix: respect semver build identifiers for nix (#11915)

nix/node_modules.nix

@@ -20,7 +20,7 @@ let
 in
 stdenvNoCC.mkDerivation {
   pname = "opencode-node_modules";
-  version = "${packageJson.version}-${rev}";
+  version = "${packageJson.version}+${lib.replaceString "-" "." rev}";
 
   src = lib.fileset.toSource {
     root = ../.;