fixes #5966 - pin execjs for Ruby 1.8 compatibility
(cherry picked from commit bb0d37fc3afa585f889e8064c9a44e97465121a3)(cherry picked from commit 0fe0d1a5cb5a18315e123411efe541f48f5da402)
fixes #5966 - pin execjs for Ruby 1.8 compatibility
(cherry picked from commit bb0d37fc3afa585f889e8064c9a44e97465121a3)
(cherry picked from commit 0fe0d1a5cb5a18315e123411efe541f48f5da402)