Update github.com/google/go-github to v51 (#23946)

`github.com/google/go-github` has new major version releases frequently.
It is required to update all import path, in additional to `go.mod`

services/migrations/error.go

@@ -7,7 +7,7 @@ package migrations
 import (
 	"errors"
 
-	"github.com/google/go-github/v45/github"
+	"github.com/google/go-github/v51/github"
 )
 
 // ErrRepoNotCreated returns the error that repository not created