chore(deps): update postgres:18.1-alpine docker digest to b40d931 (#3287)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
   test:
     services:
       postgres:
-        image: postgres:18.1-alpine@sha256:b5f0dfb46e028c156ff4e3dd2908fdf3474e6bd7837902d0e0151e4e30ad711f
+        image: postgres:18.1-alpine@sha256:b40d931bd0e7ce6eecc59a5a6ac3b3c04a01e559750e73e7086b6dbd7f8bf545
         ports:
         - 5432:5432
         # needed because the postgres container does not provide a healthcheck