chore(deps): update postgres docker tag to v13.20

Author: renovate[bot]

docker-compose.dev.yml

@@ -2,7 +2,7 @@ version: '3.8'
 
 services:
   db:
-    image: postgres:13.2-alpine
+    image: postgres:13.20-alpine
     ports:
       - "5432:5432"
     env_file:

docker-compose.yml

@@ -22,7 +22,7 @@ services:
         max-file: "10"
 
   postgres:
-    image: postgres:13.2-alpine
+    image: postgres:13.20-alpine
     container_name: todo-bot-postgres
     environment:
       - POSTGRES_USER=postgres