ci.yml in alchemy-pg_search-5.1.0

- old
+ new

@@ -7,10 +7,10 @@
     runs-on: ubuntu-latest
     env:
       RAILS_ENV: test
     services:
       postgres:
-        image: postgres:11
+        image: postgres:12
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: password
           POSTGRES_DB: alchemy_pg_search_test
         ports: ["5432:5432"]