Vendor Update: go-gitlab v0.22.1 -> v0.31.0 (#11136)

* vendor update: go-gitlab to v0.31.0

* migrate client init to v0.31.0

* refactor

vendor/google.golang.org/protobuf/internal/impl/weak.go

@@ -0,0 +1,46 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"reflect"
+
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// weakFields adds methods to the exported WeakFields type for internal use.
+//
+// The exported type is an alias to an unnamed type, so methods can't be
+// defined directly on it.
+type weakFields WeakFields
+
+func (w *weakFields) get(num pref.FieldNumber) (_ pref.ProtoMessage, ok bool) {
+	if *w == nil {
+		return nil, false
+	}
+	m, ok := (*w)[int32(num)]
+	if !ok {
+		return nil, false
+	}
+	// As a legacy quirk, consider a typed nil to be unset.
+	//
+	// TODO: Consider fixing the generated set methods to clear the field
+	// when provided with a typed nil.
+	if v := reflect.ValueOf(m); v.Kind() == reflect.Ptr && v.IsNil() {
+		return nil, false
+	}
+	return Export{}.ProtoMessageV2Of(m), true
+}
+
+func (w *weakFields) set(num pref.FieldNumber, m pref.ProtoMessage) {
+	if *w == nil {
+		*w = make(weakFields)
+	}
+	(*w)[int32(num)] = Export{}.ProtoMessageV1Of(m)
+}
+
+func (w *weakFields) clear(num pref.FieldNumber) {
+	delete(*w, int32(num))
+}