⬆️ Set fflate@0.6.9 on n8n-nodes-base

Snyk has created this PR to upgrade fflate from 0.4.8 to 0.6.9.

See this package in npm:
https://www.npmjs.com/package/fflate

See this project in Snyk:
https://app.snyk.io/org/janober/project/a08454f4-33a1-49bc-bb2a-f31792e94f42?utm_source=github&utm_medium=upgrade-pr

packages/nodes-base/package.json

@@ -602,7 +602,7 @@
     "cheerio": "1.0.0-rc.6",
     "cron": "^1.7.2",
     "eventsource": "^1.0.7",
-    "fflate": "^0.4.8",
+    "fflate": "^0.6.9",
     "formidable": "^1.2.1",
     "get-system-fonts": "^2.0.2",
     "glob-promise": "^3.4.0",