Update dependency compression to v1.7.3

Author: renovate[bot]

appengine/loopback/package.json

@@ -16,7 +16,7 @@
     "posttest": "npm run lint && nsp check"
   },
   "dependencies": {
-    "compression": "1.7.2",
+    "compression": "1.7.3",
     "cors": "2.8.4",
     "helmet": "3.12.0",
     "loopback-boot": "2.27.1",