fix: middleware test

Gin update to 1.7 broke the work with IP addresses of clients:
now 'X-Forwarded-For' and 'X-Real-Ip' headers needs to be set as
trusted for 'c.ClientIP()' method to successfully read the client's IP
in case 'gin.Run' method is not used. Related issue:
gin-gonic/gin#2697

internal/platform/gin/auditlog/middleware_test.go

@@ -68,7 +68,7 @@ func TestMiddleware(t *testing.T) {
 				RequestBody:  body,
 				StatusCode:   http.StatusOK,
 				ResponseTime: 1000,
-				ResponseSize: 18,
+				ResponseSize: 17,
 				Errors:       nil,
 			},
 		}
@@ -77,7 +77,9 @@ func TestMiddleware(t *testing.T) {
 
 		middleware := Middleware(driver, WithClock(clock), WithUserIDExtractor(userIDExtractor))
 
+		gin.SetMode(gin.ReleaseMode)
 		engine := gin.New()
+		engine.TrustedPlatform = "X-Real-Ip"
 		engine.Use(func(c *gin.Context) { c.Set(correlationid.ContextKey, "cid") }, middleware)
 		engine.POST("/", func(c *gin.Context) {
 			clock.Advance(time.Second)