🩹 Fix limiter middleware db connection (#1813)

* remove release() method

* Revert "remove release() method"

This reverts commit fdfc8da.

* Rearrange mutexes in limiter_fixed.go

* refactor limiter_fixed.go

* Update limiter_fixed.go

Co-authored-by: RW <rene@gofiber.io>

middleware/limiter/limiter_fixed.go

@@ -92,9 +92,13 @@ func (FixedWindow) New(cfg Config) fiber.Handler {
 		// Check for SkipFailedRequests and SkipSuccessfulRequests
 		if (cfg.SkipSuccessfulRequests && c.Response().StatusCode() < fiber.StatusBadRequest) ||
 			(cfg.SkipFailedRequests && c.Response().StatusCode() >= fiber.StatusBadRequest) {
+			// Lock entry
 			mux.Lock()
+			e = manager.get(key)
 			e.currHits--
 			remaining++
+			manager.set(key, e, cfg.Expiration)
+			// Unlock entry
 			mux.Unlock()
 		}