update postgres and cantaloupe images

Author: nabeta

.github/workflows/rubyonrails.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     services:
       postgres:
-        image: postgres:12-alpine
+        image: postgres:13-alpine
         ports:
           - "5432:5432"
         env:

docker-compose.yml

@@ -131,7 +131,7 @@ services:
       retries: 3
 
   cantaloupe:
-    image: uclalibrary/cantaloupe:5.0.5-2
+    image: uclalibrary/cantaloupe:5.0.5-4
     expose:
       - 8182
     restart: always