chore(deps-dev): bump rollup from 2.4.0 to 2.6.0

Bumps [rollup](https://github.com/rollup/rollup) from 2.4.0 to 2.6.0.
- [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/v2.4.0...v2.6.0)

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

web3.js/package-lock.json

@@ -18772,9 +18772,9 @@
       }
     },
     "rollup": {
-      "version": "2.4.0",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.4.0.tgz",
-      "integrity": "sha512-dYE2ZKl9+kxuFKDaaSuauZjIPa8hcKDqI7WrOq1pTXYG4GJw+6ypLifGIvCKw5yJpSmuFohuimYpg0wfRXTCLw==",
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.6.0.tgz",
+      "integrity": "sha512-qbvQ9ZbvbhBdtRBZ/A4g+9z3iJQ1rHAtjinn3FiN+j5tfz8xiNyTE1JEEMcFWqlH7+NHadI9ieeqKdp8HwYLnQ==",
       "dev": true,
       "requires": {
         "fsevents": "~2.1.2"

web3.js/package.json

@@ -120,7 +120,7 @@
     "marked": "^0.8.0",
     "prettier": "^2.0.0",
     "rimraf": "3.0.2",
-    "rollup": "2.4.0",
+    "rollup": "2.6.0",
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-commonjs": "^10.0.0",
     "rollup-plugin-copy": "^3.3.0",