simpledbus: correct license

# see https://github.com/simpleble/simpleble/releases/tag/v0.9.0 for license change

pkgs/by-name/si/simpledbus/package.nix

@@ -40,7 +40,9 @@ stdenv.mkDerivation (finalAttrs: {
   meta = {
     description = "C++ wrapper for libdbus-1";
     homepage = "https://github.com/OpenBluetoothToolbox/SimpleBLE";
-    license = lib.licenses.gpl3Only;
+    # SimpleBLE (which SimpleDBus is part of) is under the Business Source License 1.1 (BUSL-1.1)
+    # since version 0.9.0
+    license = lib.licenses.bsl11;
     platforms = lib.platforms.linux;
     maintainers = with lib.maintainers; [ aciceri ];
   };