fix: upgrade @types/classnames from 2.2.11 to 2.3.0 (#428)

Snyk has created this PR to upgrade @types/classnames from 2.2.11 to 2.3.0.

See this package in npm:
https://www.npmjs.com/package/@types/classnames

See this project in Snyk:
https://app.snyk.io/org/lukemnet/project/31f4df4e-4e87-4525-a2e6-31950e541955?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -8,7 +8,7 @@
     "@testing-library/jest-dom": "5.11.10",
     "@testing-library/react": "10.4.9",
     "@testing-library/user-event": "13.1.5",
-    "@types/classnames": "2.2.11",
+    "@types/classnames": "2.3.0",
     "@types/jest": "26.0.22",
     "@types/node": "^14.14.41",
     "@types/react": "17.0.3",