refactor: replace golang.org/x/exp/slices with slices (#16772)

The experimental functions in `golang.org/x/exp/slices` are now
available in the standard library since Go 1.21.

Reference: https://go.dev/doc/go1.21#slices

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

agent/agent.go

@@ -14,6 +14,7 @@ import (
 	"os"
 	"os/user"
 	"path/filepath"
+	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -26,7 +27,6 @@ import (
 	"github.com/prometheus/common/expfmt"
 	"github.com/spf13/afero"
 	"go.uber.org/atomic"
-	"golang.org/x/exp/slices"
 	"golang.org/x/sync/errgroup"
 	"golang.org/x/xerrors"
 	"google.golang.org/protobuf/types/known/timestamppb"

agent/agent_test.go

@@ -19,6 +19,7 @@ import (
 	"path/filepath"
 	"regexp"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"sync/atomic"
@@ -41,7 +42,6 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"golang.org/x/crypto/ssh"
-	"golang.org/x/exp/slices"
 	"golang.org/x/xerrors"
 
 	"cdr.dev/slog"

agent/agentssh/agentssh.go

@@ -12,6 +12,7 @@ import (
 	"os/user"
 	"path/filepath"
 	"runtime"
+	"slices"
 	"strings"
 	"sync"
 	"time"
@@ -24,7 +25,6 @@ import (
 	"github.com/spf13/afero"
 	"go.uber.org/atomic"
 	gossh "golang.org/x/crypto/ssh"
-	"golang.org/x/exp/slices"
 	"golang.org/x/xerrors"
 
 	"cdr.dev/slog"

agent/agenttest/client.go

@@ -3,6 +3,7 @@ package agenttest
 import (
 	"context"
 	"io"
+	"slices"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -12,7 +13,6 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"golang.org/x/exp/maps"
-	"golang.org/x/exp/slices"
 	"golang.org/x/xerrors"
 	"google.golang.org/protobuf/types/known/durationpb"
 	"google.golang.org/protobuf/types/known/emptypb"

agent/reconnectingpty/buffered.go

@@ -5,11 +5,11 @@ import (
 	"errors"
 	"io"
 	"net"
+	"slices"
 	"time"
 
 	"github.com/armon/circbuf"
 	"github.com/prometheus/client_golang/prometheus"
-	"golang.org/x/exp/slices"
 	"golang.org/x/xerrors"
 
 	"cdr.dev/slog"