Replace go.uber.org/atomic with sync/atomic

[serprex]

What was changed

go 1.19 introduced atomic types
https://tip.golang.org/doc/go1.19#atomic_types

Why?

sync/atomic is already being used here. I intend to update dependencies so that go.uber.org/atomic can also be removed as an indirect dependency

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[serprex]

I always struggle with how to manage go.mod/go.sum changes

[cretz]

I always struggle with how to manage go.mod/go.sum changes

Yeah, our repo makes this a bit hard. Basically you need to run go mod tidy in every directory that has a go.mod in this repo.

This LGTM, will wait for @Quinn-With-Two-Ns to take a look

[Quinn-With-Two-Ns]

LGTM, I have been meaning to do this anyway

[cretz]

Merged, thanks!