[buddhu]

Not very likely. Spinoza lived in the 1600s, and European knowledge of classical and pre-classical Indian thought didn't really take off until about the late 1700s. On the Upanishads in particular, there was apparently a translation of some of them into Persian in the 1600s, but Spinoza would have had no exposure to that. A translation into Latin came along in the late 1700s.