fix postgres regex

Author: michaeljguarino

vendor.json

@@ -2,7 +2,7 @@
   "docker.io/nginx": "stable-alpine[34]\\.[0-9]+-slim",
   "docker.io/bitnami/redis": "7\\.4\\.[0-9]+-debian-[0-9]+-r[0-9]+",
   "docker.io/kubernetesui/dashboard-api": "1\\.[0-9]+\\.[0-9]+",
-  "docker.io/postgres": "1[4567]",
+  "docker.io/postgres": "^1[4567]$",
   "docker.io/elasticsearch": "8\\.11\\.[0-9]+",
   "docker.io/opensearchproject/opensearch": "latest",
   "public.ecr.aws/localstack/localstack": "latest",