Update go-github and remove redirect

vendor/github.com/google/go-github/v48/github/pulls_threads.go

@@ -0,0 +1,17 @@
+// Copyright 2022 The go-github 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 github
+
+// PullRequestThread represents a thread of comments on a pull request.
+type PullRequestThread struct {
+	ID       *int64                `json:"id,omitempty"`
+	NodeID   *string               `json:"node_id,omitempty"`
+	Comments []*PullRequestComment `json:"comments,omitempty"`
+}
+
+func (p PullRequestThread) String() string {
+	return Stringify(p)
+}