Update postgres Docker tag to v16.3 (#54)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| postgres | minor | `16.2-alpine3.18` -> `16.3-alpine3.18` |

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docker-compose.yml

@@ -38,7 +38,7 @@ services:
       spring.flyway.default-schema: "private"
       spring.flyway.schemas: "private, public"
   db:
-    image: "postgres:16.2-alpine3.18"
+    image: "postgres:16.3-alpine3.18"
     ports:
       - "127.0.0.1:5432:5432"
     environment: