Aaron U'Ren 46a1b17903 feat(go): upgrade 1.20.13 -> 1.21.7 + dep update
Upgrades to Go 1.21.7 now that Go 1.20 is no longer being maintained.

It also, resolves the race conditions that we were seeing with BGP
server tests when we upgraded from 1.20 -> 1.21. This appears to be
because some efficiency changed in 1.21 that caused BGP to write to the
events at the same time that the test harness was trying to read from
them. Solved this in a coarse manner by adding surrounding mutexes to
the test code.

Additionally, upgraded dependencies.
2024-03-02 15:45:54 -06:00
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