Update Go-Git to take advantage of LargeObjectThreshold (#16316)

Following the merging of https://github.com/go-git/go-git/pull/330 we
can now add a setting to avoid go-git reading and caching large objects.

Signed-off-by: Andrew Thornton <art27@cantab.net>

modules/setting/git.go

@@ -25,6 +25,7 @@ var (
 		GCArgs                    []string `ini:"GC_ARGS" delim:" "`
 		EnableAutoGitWireProtocol bool
 		PullRequestPushMessage    bool
+		LargeObjectThreshold      int64
 		Timeout                   struct {
 			Default int
 			Migrate int
@@ -45,6 +46,7 @@ var (
 		GCArgs:                    []string{},
 		EnableAutoGitWireProtocol: true,
 		PullRequestPushMessage:    true,
+		LargeObjectThreshold:      1024 * 1024,
 		Timeout: struct {
 			Default int
 			Migrate int