treewide: use log/slog instead of golang.org/x/exp/slog

Now that we are using Go v1.21, we can use the `log/slog` from the
standard library instead of the experimental package.

Signed-off-by: Robin Hahling <[email protected]>

cmd/observe/io_reader_observer_test.go

@@ -6,6 +6,7 @@ package observe
 import (
 	"context"
 	"io"
+	"log/slog"
 	"strings"
 	"testing"
 
@@ -14,7 +15,6 @@ import (
 	"github.com/cilium/hubble/pkg/logger"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"golang.org/x/exp/slog"
 	"google.golang.org/protobuf/types/known/timestamppb"
 )
 

cmd/root.go

@@ -4,6 +4,7 @@
 package cmd
 
 import (
+	"log/slog"
 	"os"
 
 	"github.com/cilium/hubble/cmd/common/config"
@@ -20,7 +21,6 @@ import (
 	"github.com/cilium/hubble/cmd/watch"
 	"github.com/cilium/hubble/pkg"
 	"github.com/cilium/hubble/pkg/logger"
-	"golang.org/x/exp/slog"
 	"google.golang.org/grpc"
 
 	"github.com/spf13/cobra"

go.mod

@@ -11,7 +11,6 @@ require (
 	github.com/spf13/pflag v1.0.6-0.20210604193023-d5e0c0615ace
 	github.com/spf13/viper v1.16.0
 	github.com/stretchr/testify v1.8.4
-	golang.org/x/exp v0.0.0-20230801115018-d63ba01acd4b
 	golang.org/x/sys v0.11.0
 	google.golang.org/grpc v1.57.0
 	google.golang.org/protobuf v1.31.0
@@ -66,6 +65,7 @@ require (
 	github.com/vishvananda/netns v0.0.4 // indirect
 	github.com/yusufpapurcu/wmi v1.2.3 // indirect
 	go.mongodb.org/mongo-driver v1.11.3 // indirect
+	golang.org/x/exp v0.0.0-20230809094429-853ea248256d // indirect
 	golang.org/x/net v0.11.0 // indirect
 	golang.org/x/sync v0.3.0 // indirect
 	golang.org/x/text v0.10.0 // indirect

pkg/logger/logger.go

@@ -4,9 +4,8 @@
 package logger
 
 import (
+	"log/slog"
 	"sync"
-
-	"golang.org/x/exp/slog" // TODO use std library once Go v1.21 is out
 )
 
 var (