chore(deps): update hashicorp/consul docker tag to v1.21.1

Author: renovate[bot]

test/integration/docker-compose.yml

@@ -3,7 +3,7 @@ version: '3.7'
 services:
 
   consul-server1:
-    image: hashicorp/consul:1.11.2
+    image: hashicorp/consul:1.21.1
     container_name: consul-server1
     restart: always
     volumes:
@@ -19,7 +19,7 @@ services:
     command: "agent -bootstrap-expect=3"
 
   consul-server2:
-    image: hashicorp/consul:1.11.2
+    image: hashicorp/consul:1.21.1
     container_name: consul-server2
     restart: always
     volumes:
@@ -31,7 +31,7 @@ services:
     command: "agent -bootstrap-expect=3"
 
   consul-server3:
-    image: hashicorp/consul:1.11.2
+    image: hashicorp/consul:1.21.1
     container_name: consul-server3
     restart: always
     volumes: