Pin dependencies

Author: renovate[bot]

.devcontainer/docker-compose.yml

@@ -2,7 +2,7 @@ version: '3.6'
 
 services:
   app:
-    image: wordpress
+    image: wordpress@sha256:d5ac2ba9449cd3ade453df2209426e412f671e6185bedccc0ecf983998d6c72d
     restart: always
     ports:
       - 8080:80
@@ -15,7 +15,7 @@ services:
       - ../..:/workspaces:cached
 
   db:
-    image: mariadb
+    image: mariadb@sha256:fee2ec0d2b4f15f21aa1f88305d4085fdc0a9bb7242a1b4409f3002c6160d05b
     restart: unless-stopped
     environment:
       MYSQL_DATABASE: exampledb