chore(deps-dev): bump rollup from 2.13.1 to 2.15.0

Bumps [rollup](https://github.com/rollup/rollup) from 2.13.1 to 2.15.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v2.13.1...v2.15.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

web3.js/package-lock.json

@@ -21207,9 +21207,9 @@
       }
     },
     "rollup": {
-      "version": "2.13.1",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.13.1.tgz",
-      "integrity": "sha512-EiICynxIO1DTFmFn+/98gfaqCToK2nbjPjHJLuNvpcwc+P035VrXmJxi3JsOhqkdty+0cOEhJ26ceGTY3UPMPQ==",
+      "version": "2.15.0",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.15.0.tgz",
+      "integrity": "sha512-HAk4kyXiV5sdNDnbKWk5zBPnkX/DAgx09Kbp8rRIRDVsTUVN3vnSowR7ZHkV6/lAiE6c2TQ8HtYb72aCPGW4Jw==",
       "dev": true,
       "requires": {
         "fsevents": "~2.1.2"

web3.js/package.json

@@ -124,7 +124,7 @@
     "marked": "^1.1.0",
     "prettier": "^2.0.0",
     "rimraf": "3.0.2",
-    "rollup": "2.13.1",
+    "rollup": "2.15.0",
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-commonjs": "^10.0.0",
     "rollup-plugin-copy": "^3.3.0",