remove explicit acorn dep

package.json

@@ -19,7 +19,6 @@
   "dependencies": {
     "@next/bundle-analyzer": "^9.5.0",
     "@reach/visually-hidden": "^0.10.4",
-    "acorn": "^7.3.1",
     "actionsack": "^0.0.13",
     "axios": "^0.19.2",
     "cm-show-invisibles": "^3.0.1",

yarn.lock

@@ -2411,11 +2411,6 @@ acorn@^7.1.1:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.1.1.tgz#e35668de0b402f359de515c5482a1ab9f89a69bf"
   integrity sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==
 
-acorn@^7.3.1:
-  version "7.3.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.3.1.tgz#85010754db53c3fbaf3b9ea3e083aa5c5d147ffd"
-  integrity sha512-tLc0wSnatxAQHVHUapaHdz72pi9KUyHjq5KyHjGg9Y8Ifdc79pTh2XvI6I1/chZbnM7QtNKzh66ooDogPZSleA==
-
 acorn@^7.4.0:
   version "7.4.0"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.4.0.tgz#e1ad486e6c54501634c6c397c5c121daa383607c"