chore(deps): update postgres docker tag to v15.4 (#39)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| postgres | docker | minor | `15.3-alpine` -> `15.4-alpine` |
| postgres |  | minor | `15.3-alpine` -> `15.4-alpine` |

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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Reviewed-on: #39
Co-authored-by: renovate-bot <renovate-bot@dubas.dev>
Co-committed-by: renovate-bot <renovate-bot@dubas.dev>

.drone.yml

@@ -9,7 +9,7 @@ trigger:
 
 steps:
   - name: database healthcheck
-    image: 'postgres:15.3-alpine'
+    image: 'postgres:15.4-alpine'
     environment:
       PGUSER: postgres
       PGPASSWORD: postgres
@@ -79,7 +79,7 @@ steps:
 
 services:
   - name: db
-    image: 'postgres:15.3-alpine'
+    image: 'postgres:15.4-alpine'
     environment:
       POSTGRES_USER: postgres
       POSTGRES_PASSWORD: postgres

docker-compose.yml

@@ -1,7 +1,7 @@
 ---
 services:
   db:
-    image: 'postgres:15.3-alpine'
+    image: 'postgres:15.4-alpine'
     hostname: &db_host db
     init: true
     environment: