Take advantage of changes in recent Go versions (#3361)

Given that #2714 wasn't merged but we are now at a minimum supported Go
version of 1.20 (soon to be 1.21), I wanted to carry over some of the
changes. Namely:
- Fix the log typo
- Simplify build constraints for unix
- Use stdlib atomic package

### Pull Request Checklist

<!-- Please read
https://matrix-org.github.io/dendrite/development/contributing before
submitting your pull request -->

* [x] I have added Go unit tests or [Complement integration
tests](https://github.com/matrix-org/complement) for this PR _or_ I have
justified why this PR doesn't need tests
* [x] Pull request includes a [sign off below using a legally
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name](https://matrix-org.github.io/dendrite/development/contributing#sign-off)
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Signed-off-by: `0x1a8510f2 <admin@0x1a8510f2.space>`

---------

Co-authored-by: devonh <devon.dmytro@gmail.com>

setup/base/base.go

@@ -28,13 +28,13 @@ import (
 	_ "net/http/pprof"
 	"os"
 	"os/signal"
+	"sync/atomic"
 	"syscall"
 	"time"
 
 	sentryhttp "github.com/getsentry/sentry-go/http"
 	"github.com/matrix-org/gomatrixserverlib/fclient"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-	"go.uber.org/atomic"
 
 	"github.com/gorilla/mux"
 	"github.com/kardianos/minwinsvc"