Fix yaml formatting

Author: sysadmind

.github/workflows/ci.yml

@@ -24,8 +24,8 @@ jobs:
     strategy:
       matrix:
         # Define Postgres versions to test against.
-          postgres_version: [13.22]
-          # postgres_version: [13.22, 14.19, 15.14, 16.10, 17.6]
+        postgres_version: [13.22]
+        # postgres_version: [13.22, 14.19, 15.14, 16.10, 17.6]
     services:
       postgres:
         image: postgres:${{ matrix.postgres_version }}