Upgrade to Go 1.18 and re-vendor dependencies

vendor/github.com/prometheus/procfs/xfrm.go

@@ -112,8 +112,7 @@ func (fs FS) NewXfrmStat() (XfrmStat, error) {
 		fields := strings.Fields(s.Text())
 
 		if len(fields) != 2 {
-			return XfrmStat{}, fmt.Errorf(
-				"couldn't parse %s line %s", file.Name(), s.Text())
+			return XfrmStat{}, fmt.Errorf("couldn't parse %q line %q", file.Name(), s.Text())
 		}
 
 		name := fields[0]