build(freespace_planning_algorithms): add pybind11_vendor dependency (#7150)

Signed-off-by: Esteve Fernandez <esteve.fernandez@tier4.jp>

Author: esteve

planning/freespace_planning_algorithms/package.xml

@@ -19,6 +19,7 @@
   <depend>geometry_msgs</depend>
   <depend>nav_msgs</depend>
   <depend>nlohmann-json-dev</depend>
+  <depend>pybind11_vendor</depend>
   <depend>rosbag2_cpp</depend>
   <depend>std_msgs</depend>
   <depend>tf2</depend>