chore(deps): update postgres docker digest to 8648313 (#59)

Co-authored-by: pactflow-renovate-bot[bot] <186667433+pactflow-renovate-bot[bot]@users.noreply.github.com>

Author: pactflow-renovate-bot[bot]

docker-compose.yml

@@ -18,7 +18,7 @@ services:
       PACT_BROKER_DATABASE_CONNECT_MAX_RETRIES: "10"
       PACT_BROKER_PUBLIC_HEARTBEAT: "true"
   postgres:
-    image: postgres@sha256:ddce3a93c54af591736e8e71c036dc790a0f525bf733d65b25a1bbd0a67949ae
+    image: postgres@sha256:864831322bf2520e7d03d899b01b542de6de9ece6fe29c89f19dc5e1d5568ccf
     healthcheck:
       test: psql postgres --command "select 1" -U postgres
     ports: