Update Penumbra dependency to clean up warnings

[nealkruis]

Pull request overview

• Fixes GLFW Build Warning on Mac 10.15 #8171

Updates GLFW to v3.3.2.

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[Myoldmopar]

Indeed that got rid of the warning. It's too bad that the spurious CI failure ruined what could have been a fully green set, but oh well. I'm going to merge this, thanks @nealkruis