replace packages slog and slices from golang.org/x/exp with stdlib

since we are now at go1.21 as minimum.

smtpserver/analyze.go

@@ -3,13 +3,12 @@ package smtpserver
 import (
 	"context"
 	"fmt"
+	"log/slog"
 	"net"
 	"os"
 	"strings"
 	"time"
 
-	"golang.org/x/exp/slog"
-
 	"github.com/mjl-/bstore"
 
 	"github.com/mjl-/mox/dkim"

smtpserver/rejects.go

@@ -6,10 +6,9 @@ import (
 	"crypto/sha256"
 	"fmt"
 	"io"
+	"log/slog"
 	"os"
 
-	"golang.org/x/exp/slog"
-
 	"github.com/mjl-/bstore"
 
 	"github.com/mjl-/mox/message"

smtpserver/reputation.go

@@ -3,10 +3,9 @@ package smtpserver
 import (
 	"errors"
 	"fmt"
+	"log/slog"
 	"time"
 
-	"golang.org/x/exp/slog"
-
 	"github.com/mjl-/bstore"
 
 	"github.com/mjl-/mox/mlog"

smtpserver/server.go

@@ -15,6 +15,7 @@ import (
 	"fmt"
 	"hash"
 	"io"
+	"log/slog"
 	"math"
 	"net"
 	"net/textproto"
@@ -27,7 +28,6 @@ import (
 	"time"
 
 	"golang.org/x/exp/maps"
-	"golang.org/x/exp/slog"
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"

smtpserver/server_test.go

@@ -13,6 +13,7 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
+	"log/slog"
 	"math/big"
 	"mime/quotedprintable"
 	"net"
@@ -23,8 +24,6 @@ import (
 	"testing"
 	"time"
 
-	"golang.org/x/exp/slog"
-
 	"github.com/mjl-/bstore"
 
 	"github.com/mjl-/mox/config"