Bump @rollup/plugin-commonjs from 14.0.0 to 15.1.0 in /token/js (#491)

Bumps [@rollup/plugin-commonjs](https://github.com/rollup/plugins) from 14.0.0 to 15.1.0.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Commits](rollup/plugins@commonjs-v14.0.0...commonjs-v15.1.0)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

token/js/package-lock.json

@@ -59,7 +59,7 @@
     "@babel/preset-env": "^7.10.4",
     "@babel/preset-flow": "^7.10.4",
     "@rollup/plugin-babel": "^5.1.0",
-    "@rollup/plugin-commonjs": "^14.0.0",
+    "@rollup/plugin-commonjs": "^15.1.0",
     "babel-eslint": "^10.1.0",
     "eslint": "^7.4.0",
     "eslint-plugin-import": "^2.22.0",