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

[serprex]

raises go version to 1.18

this is a breaking change since consumers will update with errors.RedactLogEnabled.Store(&errors.RedactLogEnable). ideally this wouldn't be exposed & instead there'd be a function errors.SetRedactLogEnabled(...) & even better the enum would be an integer which could then use atomic.Int32 in behind

[serprex]

(note that modern go.uber.org/atomic uses these atomic types, their String is specialization built on top of Value which is takes interface{} for Load/Store)

https://github.com/uber-go/atomic/blob/v1.11.0/string.go#L26
https://github.com/uber-go/atomic/blob/v1.11.0/value.go#L27