Merge pull request #2644 from aledbf/update-nginx

Update nginx image version

Makefile

@@ -59,7 +59,7 @@ IMAGE = $(REGISTRY)/$(IMGNAME)
 MULTI_ARCH_IMG = $(IMAGE)-$(ARCH)
 
 # Set default base image dynamically for each arch
-BASEIMAGE?=quay.io/kubernetes-ingress-controller/nginx-$(ARCH):0.49
+BASEIMAGE?=quay.io/kubernetes-ingress-controller/nginx-$(ARCH):0.51
 
 ifeq ($(ARCH),arm)
 	QEMUARCH=arm