fix: upgrade @rollup/plugin-babel from 5.2.0 to 5.2.1

Snyk has created this PR to upgrade @rollup/plugin-babel from 5.2.0 to 5.2.1.

See this package in npm:
https://www.npmjs.com/package/@rollup/plugin-babel

See this project in Snyk:
https://app.snyk.io/org/dmaccormack/project/51e346e8-0429-4dc8-902a-93e77d72b41c?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -38,7 +38,7 @@
     "@babel/cli": "^7.11.6",
     "@babel/plugin-transform-runtime": "^7.11.5",
     "@babel/preset-env": "^7.11.5",
-    "@rollup/plugin-babel": "^5.2.0",
+    "@rollup/plugin-babel": "^5.2.1",
     "@rollup/plugin-commonjs": "^15.0.0",
     "@rollup/plugin-node-resolve": "^9.0.0",
     "babel-jest": "^26.3.0",