fix: upgrade fflate from 0.4.8 to 0.8.1

Snyk has created this PR to upgrade fflate from 0.4.8 to 0.8.1.

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

See this project in Snyk:
https://app.snyk.io/org/mrrio/project/50515eb1-b03b-4f42-9f17-cce1a33d5d1a?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -26,7 +26,7 @@
     "@babel/runtime": "^7.14.0",
     "atob": "^2.1.2",
     "btoa": "^1.2.1",
-    "fflate": "^0.4.8"
+    "fflate": "^0.8.1"
   },
   "optionalDependencies": {
     "canvg": "^3.0.6",