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
identifiable
name](https://matrix-org.github.io/dendrite/development/contributing#sign-off)
_or_ I have already signed off privately

Signed-off-by: `0x1a8510f2 <admin@0x1a8510f2.space>`

---------

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

federationapi/queue/destinationqueue.go

@@ -19,6 +19,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/matrix-org/gomatrix"
@@ -26,7 +27,6 @@ import (
 	"github.com/matrix-org/gomatrixserverlib/fclient"
 	"github.com/matrix-org/gomatrixserverlib/spec"
 	"github.com/sirupsen/logrus"
-	"go.uber.org/atomic"
 
 	"github.com/matrix-org/dendrite/federationapi/statistics"
 	"github.com/matrix-org/dendrite/federationapi/storage"

federationapi/queue/queue_test.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -26,7 +27,6 @@ import (
 	"github.com/matrix-org/dendrite/test/testrig"
 	"github.com/matrix-org/gomatrixserverlib/fclient"
 	"github.com/matrix-org/gomatrixserverlib/spec"
-	"go.uber.org/atomic"
 	"gotest.tools/v3/poll"
 
 	"github.com/matrix-org/gomatrixserverlib"
@@ -113,8 +113,8 @@ func testSetup(failuresUntilBlacklist uint32, failuresUntilAssumedOffline uint32
 	fc := &stubFederationClient{
 		shouldTxSucceed:      shouldTxSucceed,
 		shouldTxRelaySucceed: shouldTxRelaySucceed,
-		txCount:              *atomic.NewUint32(0),
-		txRelayCount:         *atomic.NewUint32(0),
+		txCount:              atomic.Uint32{},
+		txRelayCount:         atomic.Uint32{},
 	}
 
 	stats := statistics.NewStatistics(db, failuresUntilBlacklist, failuresUntilAssumedOffline, false)