TUN-8006: Update quic-go to latest upstream

vendor/golang.org/x/mod/modfile/print.go

@@ -16,7 +16,13 @@ import (
 func Format(f *FileSyntax) []byte {
 	pr := &printer{}
 	pr.file(f)
-	return pr.Bytes()
+
+	// remove trailing blank lines
+	b := pr.Bytes()
+	for len(b) > 0 && b[len(b)-1] == '\n' && (len(b) == 1 || b[len(b)-2] == '\n') {
+		b = b[:len(b)-1]
+	}
+	return b
 }
 
 // A printer collects the state during printing of a file or expression.
@@ -59,7 +65,11 @@ func (p *printer) newline() {
 	}
 
 	p.trim()
-	p.printf("\n")
+	if b := p.Bytes(); len(b) == 0 || (len(b) >= 2 && b[len(b)-1] == '\n' && b[len(b)-2] == '\n') {
+		// skip the blank line at top of file or after a blank line
+	} else {
+		p.printf("\n")
+	}
 	for i := 0; i < p.margin; i++ {
 		p.printf("\t")
 	}