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

since we are now at go1.21 as minimum.

http/autoconf.go

@@ -3,11 +3,10 @@ package http
 import (
 	"encoding/xml"
 	"fmt"
+	"log/slog"
 	"net/http"
 	"strings"
 
-	"golang.org/x/exp/slog"
-
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"rsc.io/qr"

http/gzcache.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"io/fs"
+	"log/slog"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -16,8 +17,6 @@ import (
 	"sync"
 	"time"
 
-	"golang.org/x/exp/slog"
-
 	"github.com/mjl-/mox/mlog"
 )
 

http/mobileconfig.go

@@ -6,11 +6,11 @@ import (
 	"crypto/sha256"
 	"encoding/xml"
 	"fmt"
+	"slices"
 	"sort"
 	"strings"
 
 	"golang.org/x/exp/maps"
-	"golang.org/x/exp/slices"
 
 	"github.com/mjl-/mox/mox-"
 	"github.com/mjl-/mox/smtp"

http/mtasts.go

@@ -1,13 +1,12 @@
 package http
 
 import (
+	"log/slog"
 	"net"
 	"net/http"
 	"strings"
 	"time"
 
-	"golang.org/x/exp/slog"
-
 	"github.com/mjl-/mox/dns"
 	"github.com/mjl-/mox/mlog"
 	"github.com/mjl-/mox/mox-"

http/web.go

@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"io"
 	golog "log"
+	"log/slog"
 	"net"
 	"net/http"
 	"os"
@@ -21,7 +22,6 @@ import (
 	_ "net/http/pprof"
 
 	"golang.org/x/exp/maps"
-	"golang.org/x/exp/slog"
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"

http/webserver.go

@@ -13,6 +13,7 @@ import (
 	"io"
 	"io/fs"
 	golog "log"
+	"log/slog"
 	"net"
 	"net/http"
 	"net/http/httputil"
@@ -25,8 +26,6 @@ import (
 	"syscall"
 	"time"
 
-	"golang.org/x/exp/slog"
-
 	"github.com/mjl-/mox/config"
 	"github.com/mjl-/mox/dns"
 	"github.com/mjl-/mox/mlog"