chore(deps): replace dependency rollup-plugin-babel with @rollup/plugin-babel ^5.0.0

Author: renovate[bot]

package-lock.json

@@ -52,7 +52,7 @@
     "node-sass": "^4.13.0",
     "prettier": "^2.0.0",
     "rollup": "^2.0.0",
-    "rollup-plugin-babel": "^4.3.2",
+    "@rollup/plugin-babel": "^5.0.0",
     "rollup-plugin-commonjs": "^10.0.0",
     "rollup-plugin-node-resolve": "^5.0.2",
     "serve": "^11.0.1",