Replace golang.org/x/exp with stdlib

These experimental packages are now available in the Go standard
library since Go 1.21.

	1. golang.org/x/exp/slices -> slices [1]
	2. golang.org/x/exp/maps -> maps [2]

[1]: https://go.dev/doc/go1.21#slices
[2]: https://go.dev/doc/go1.21#maps

Signed-off-by: Eng Zer Jun <[email protected]>

Author: Juneezee

go.mod

@@ -12,7 +12,6 @@ require (
 	github.com/sirupsen/logrus v1.9.3
 	github.com/stretchr/testify v1.9.0
 	golang.org/x/crypto v0.31.0
-	golang.org/x/exp v0.0.0-20240112132812-db7319d0e0e3
 	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/api v0.30.4
 	k8s.io/apiextensions-apiserver v0.25.9

go.sum

@@ -121,8 +121,6 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.31.0 h1:ihbySMvVjLAeSH1IbfcRTkD/iNscyz8rGzjF/E5hV6U=
 golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
-golang.org/x/exp v0.0.0-20240112132812-db7319d0e0e3 h1:hNQpMuAJe5CtcUqCXaWga3FHu+kQvCqcsoVaQgSV60o=
-golang.org/x/exp v0.0.0-20240112132812-db7319d0e0e3/go.mod h1:idGWGoKP1toJGkd5/ig9ZLuPcZBC3ewk7SzmH0uou08=
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=

pkg/cluster/k8sres.go

@@ -4,27 +4,26 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"maps"
 	"path"
+	"slices"
 	"sort"
 	"strings"
 
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 
 	appsv1 "k8s.io/api/apps/v1"
+	batchv1 "k8s.io/api/batch/v1"
 	v1 "k8s.io/api/core/v1"
 	policyv1 "k8s.io/api/policy/v1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/intstr"
 
-	"golang.org/x/exp/maps"
-	"golang.org/x/exp/slices"
-	batchv1 "k8s.io/api/batch/v1"
-	"k8s.io/apimachinery/pkg/labels"
-
 	acidv1 "github.com/zalando/postgres-operator/pkg/apis/acid.zalan.do/v1"
 	"github.com/zalando/postgres-operator/pkg/spec"
 	"github.com/zalando/postgres-operator/pkg/util"

pkg/cluster/pod.go

@@ -3,12 +3,11 @@ package cluster
 import (
 	"context"
 	"fmt"
+	"slices"
 	"sort"
 	"strconv"
 	"time"
 
-	"golang.org/x/exp/slices"
-
 	appsv1 "k8s.io/api/apps/v1"
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

pkg/cluster/sync.go

@@ -4,8 +4,10 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"maps"
 	"reflect"
 	"regexp"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -15,8 +17,6 @@ import (
 	"github.com/zalando/postgres-operator/pkg/util"
 	"github.com/zalando/postgres-operator/pkg/util/constants"
 	"github.com/zalando/postgres-operator/pkg/util/k8sutil"
-	"golang.org/x/exp/maps"
-	"golang.org/x/exp/slices"
 	batchv1 "k8s.io/api/batch/v1"
 	v1 "k8s.io/api/core/v1"
 	policyv1 "k8s.io/api/policy/v1"

pkg/cluster/sync_test.go

@@ -2,15 +2,14 @@ package cluster
 
 import (
 	"bytes"
+	"context"
 	"fmt"
 	"io"
 	"net/http"
+	"slices"
 	"testing"
 	"time"
 
-	"context"
-
-	"golang.org/x/exp/slices"
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"