Tools: Use latest minor release of Postgres 13 in sample docker-compose files (#5797)

docker-compose.db-dev.yml

@@ -6,7 +6,7 @@ version: '3'
 
 services:
     db:
-        image: postgres:13.1
+        image: postgres:13
         command: postgres -c work_mem=100000
         ports:
             - "5432:5432"
@@ -14,7 +14,7 @@ services:
             - POSTGRES_PASSWORD=joplin
             - POSTGRES_USER=joplin
             - POSTGRES_DB=joplin
-        
+     
         # Use this to specify additional Postgres
         # config parameters:
         #

docker-compose.server-dev.yml

@@ -18,7 +18,7 @@ services:
             - POSTGRES_PORT=5432
             - POSTGRES_HOST=localhost
     db:
-        image: postgres:13.1
+        image: postgres:13
         ports:
             - "5432:5432"
         environment:

docker-compose.server.yml

@@ -8,7 +8,7 @@ version: '3'
 
 services:
     db:
-        image: postgres:13.1
+        image: postgres:13
         volumes:
             - ./data/postgres:/var/lib/postgresql/data
         ports: