fix: upgrade autoprefixer from 9.8.6 to 9.8.8

Snyk has created this PR to upgrade autoprefixer from 9.8.6 to 9.8.8.

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

See this project in Snyk:
https://app.snyk.io/org/reactioncommerce/project/536303cd-177f-47dd-aa8b-35217cef374d?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -96,7 +96,7 @@
     "apollo-link-http": "1.5.16",
     "apollo-link-ws": "1.0.19",
     "apollo-utilities": "1.3.4",
-    "autoprefixer": "^9.6.5",
+    "autoprefixer": "^9.8.8",
     "bootstrap": "^3.4.1",
     "classnames": "^2.2.5",
     "clone": "^2.1.2",