chore(deps): update postgres:18.1-alpine docker digest to c7d88b9

Author: renovate[bot]

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
         ports:
         - 6379:6379
       postgres:
-        image: postgres:18.1-alpine@sha256:154ea39af68ff30dec041cd1f1b5600009993724c811dbadde54126eb10bedd1
+        image: postgres:18.1-alpine@sha256:c7d88b93a04dd8604dba175203bcebecff71f6e04b2e1f0af651c997358396b2
         ports:
         - 5432:5432
         # needed because the postgres container does not provide a healthcheck