Merge pull request #249101 from motiejus/headscale-oidc

headscale.oidc: client_secret_path is a string

nixos/modules/services/networking/headscale.nix

···
               };
 
               client_secret_path = mkOption {
-                type = types.nullOr types.path;
+                type = types.nullOr types.str;
                 default = null;
                 description = lib.mdDoc ''
                   Path to OpenID Connect client secret file. Expands environment variables in format ''${VAR}.