Bump Go dependency to 1.16
What does this MR do and why?
This MR bumps the Go dependency in the source installation and upgrade docs to 1.16, because workhorse fails to build on 1.15 (see #345029 (closed))
How to set up and validate locally
- Try building workhorse on
14-4-stable
using Go 1.15 and fail (see #345029 (closed)) - Successfully build workhorse using Go 1.16
MR acceptance checklist
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