build(deps): bump postgres in /examples/shared/postgres

Bumps postgres from `c3ae2ed` to `4aea012`.

---
updated-dependencies:
- dependency-name: postgres
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

examples/shared/postgres/Dockerfile

@@ -1,3 +1,3 @@
-FROM postgres:latest@sha256:c3ae2edaab802159e3c3528c51002441ed2e0ddc7ac58f66628f74eca2869535
+FROM postgres:latest@sha256:4aea012537edfad80f98d870a36e6b90b4c09b27be7f4b4759d72db863baeebb
 COPY docker-healthcheck.sh /usr/local/bin/
 HEALTHCHECK CMD ["docker-healthcheck.sh"]