chore(deps): update postgres docker digest to 1a7c911 (#156)

Ref: PACT-445

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@sha256:41fc5342eefba6cc2ccda736aaf034bbbb7c3df0fdb81516eba1ba33f360162c
+    image: postgres@sha256:1a7c9115671c686384cf4cd9fb50b682f8d5df9bb1d26070001741a064dd04b4
     healthcheck:
       test: psql postgres --command "select 1" -U postgres
     ports: