npm: bump rollup-plugin-copy from 3.3.0 to 3.4.0 in /dashboard (#824)

Bumps [rollup-plugin-copy](https://github.com/vladshcherbin/rollup-plugin-copy) from 3.3.0 to 3.4.0.
- [Release notes](https://github.com/vladshcherbin/rollup-plugin-copy/releases)
- [Commits](vladshcherbin/rollup-plugin-copy@3.3.0...3.4.0)

---
updated-dependencies:
- dependency-name: rollup-plugin-copy
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

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

Author: dependabot[bot]

dashboard/package-lock.json

@@ -45,7 +45,7 @@
     "jsdom": "^15.2.1",
     "ncp": "^2.0.0",
     "rollup": "^1.32.1",
-    "rollup-plugin-copy": "^3.3.0",
+    "rollup-plugin-copy": "^3.4.0",
     "rollup-plugin-javascript-obfuscator": "^1.0.4",
     "rollup-plugin-typescript": "^1.0.1",
     "ts-node": "^7.0.1",