chore(deps): update postgres docker digest to 6f3e42a (#151)

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:b3ef52d269e0050ac3ba8266d8bc9650987412f60d66472fdf7e14f523ecc506
+    image: postgres@sha256:6f3e42ad37decc037c508dd405f5941c6dfa7d21f21a7237a43bde9def1e295e
     healthcheck:
       test: psql postgres --command "select 1" -U postgres
     ports: