chore: update linter

pkg/middlewares/metrics/metrics.go

@@ -166,6 +166,8 @@ func containsHeader(req *http.Request, name, value string) bool {
 // values that are not part of the set of HTTP verbs are replaced with EXTENSION_METHOD.
 // See https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods
 // https://datatracker.ietf.org/doc/html/rfc2616/#section-5.1.1.
+//
+//nolint:usestdlibvars
 func getMethod(r *http.Request) string {
 	if !utf8.ValidString(r.Method) {
 		log.WithoutContext().Warnf("Invalid HTTP method encoding: %s", r.Method)

pkg/middlewares/ratelimiter/rate_limiter.go

@@ -166,7 +166,7 @@ func (rl *rateLimiter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	delay := res.Delay()
 	if delay > rl.maxDelay {
 		res.Cancel()
-		rl.serveDelayError(ctx, w, r, delay)
+		rl.serveDelayError(ctx, w, delay)
 		return
 	}
 
@@ -174,7 +174,7 @@ func (rl *rateLimiter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	rl.next.ServeHTTP(w, r)
 }
 
-func (rl *rateLimiter) serveDelayError(ctx context.Context, w http.ResponseWriter, r *http.Request, delay time.Duration) {
+func (rl *rateLimiter) serveDelayError(ctx context.Context, w http.ResponseWriter, delay time.Duration) {
 	w.Header().Set("Retry-After", fmt.Sprintf("%.0f", math.Ceil(delay.Seconds())))
 	w.Header().Set("X-Retry-In", delay.String())
 	w.WriteHeader(http.StatusTooManyRequests)