Replace golang.org/x/exp with stdlib

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

Reference: https://go.dev/doc/go1.21#slices
Reference: https://go.dev/doc/go1.21#cmp
Signed-off-by: Eng Zer Jun <[email protected]>

go.mod

@@ -41,7 +41,6 @@ require (
 	go.uber.org/zap v1.27.0
 	go.uber.org/zap/exp v0.3.0
 	golang.org/x/crypto v0.32.0
-	golang.org/x/exp v0.0.0-20250106191152-7588d65b2ba8
 	golang.org/x/mod v0.22.0
 	golang.org/x/net v0.34.0
 	golang.org/x/sync v0.10.0
@@ -122,6 +121,7 @@ require (
 	go.opentelemetry.io/otel/trace v1.33.0 // indirect
 	go.uber.org/mock v0.5.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/exp v0.0.0-20250106191152-7588d65b2ba8 // indirect
 	golang.org/x/sys v0.29.0 // indirect
 	golang.org/x/text v0.21.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20250115164207-1a7da9e5054f // indirect

private/buf/bufwkt/cmd/wkt-go-data/main.go

@@ -16,6 +16,7 @@ package main
 
 import (
 	"bytes"
+	"cmp"
 	"context"
 	"errors"
 	"fmt"
@@ -25,8 +26,6 @@ import (
 	"sort"
 	"strings"
 
-	"golang.org/x/exp/constraints"
-
 	"github.com/bufbuild/buf/private/bufpkg/bufanalysis"
 	"github.com/bufbuild/buf/private/bufpkg/bufimage"
 	"github.com/bufbuild/buf/private/bufpkg/bufmodule"
@@ -400,7 +399,7 @@ type keyValPair[K any, V any] struct {
 	val V
 }
 
-func sortedPairs[K constraints.Ordered, V any](m map[K]V) []keyValPair[K, V] {
+func sortedPairs[K cmp.Ordered, V any](m map[K]V) []keyValPair[K, V] {
 	ret := make([]keyValPair[K, V], 0, len(m))
 	for key := range m {
 		ret = append(ret, keyValPair[K, V]{key: key, val: m[key]})

private/bufpkg/bufimage/bufimagemodify/internal/field_options_trie.go

@@ -16,8 +16,7 @@ package internal
 
 import (
 	"sort"
-
-	"golang.org/x/exp/slices"
+	"slices"
 )
 
 // fieldOptionsTrie stores paths to FieldOptions (tag 8 of a FieldDescriptorProto).