chore(deps): update all non-major dependencies docker tags

This MR contains the following updates:

Package	Type	Update	Change
node	stage	patch	12.16.0-alpine -> 12.16.1-alpine
popper.js (source)		minor	1.12.9 -> 1.16.1
requests (changelog)		minor	==2.22.0 -> ==2.23.0
sphinx		patch	==2.4.1 -> ==2.4.2

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