Go: Replace golang.org/x/exp/slices with slices. (kubernetes#12779)

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

go.mod

@@ -26,7 +26,6 @@ require (
 	github.com/yudai/gojsondiff v1.0.0
 	github.com/zakjan/cert-chain-resolver v0.0.0-20221221105603-fcedb00c5b30
 	golang.org/x/crypto v0.32.0
-	golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56
 	google.golang.org/grpc v1.70.0
 	google.golang.org/grpc/examples v0.0.0-20240223204917-5ccf176a08ab
 	gopkg.in/go-playground/pool.v3 v3.1.1

go.sum

@@ -246,8 +246,6 @@ 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 v0.32.0 h1:euUpcYgM8WcP71gNpTqQCn6rC2t6ULUPiOzfWaXVVfc=
 golang.org/x/crypto v0.32.0/go.mod h1:ZnnJkOaASj8g0AjIduWNlq2NRxL0PlBrbKVyZ6V/Ugc=
-golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56 h1:2dVuKD2vS7b0QIHQbpyTISPd0LeHDbnYEryqj5Q1ug8=
-golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56/go.mod h1:M4RDyNAINzryxdtnbRXRL/OHtkFuWGRjvuhBJpk2IlY=
 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 v0.22.0 h1:D4nJWe9zXqHOmWqj4VMOJhvzj7bEZg4wEYa759z1pH4=

internal/ingress/annotations/customheaders/main.go

@@ -20,12 +20,12 @@ import (
 	"fmt"
 	"reflect"
 	"regexp"
+	"slices"
 
 	"k8s.io/klog/v2"
 
 	networking "k8s.io/api/networking/v1"
 
-	"golang.org/x/exp/slices"
 	"k8s.io/ingress-nginx/internal/ingress/annotations/parser"
 	ing_errors "k8s.io/ingress-nginx/internal/ingress/errors"
 	"k8s.io/ingress-nginx/internal/ingress/resolver"