Bump rollup from 2.79.1 to 3.29.5 in /packages/webchannel-wrapper

Bumps [rollup](https://github.com/rollup/rollup) from 2.79.1 to 3.29.5.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v2.79.1...v3.29.5)

---
updated-dependencies:
- dependency-name: rollup
  dependency-type: direct:development
...

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

Author: dependabot[bot]

packages/webchannel-wrapper/package.json

@@ -35,7 +35,7 @@
   "devDependencies": {
     "closure-net": "git+https://github.com/google/closure-net.git#0412666",
     "@rollup/plugin-commonjs": "21.1.0",
-    "rollup": "2.79.1",
+    "rollup": "3.29.5",
     "rollup-plugin-copy": "3.5.0",
     "rollup-plugin-sourcemaps": "0.6.3",
     "rollup-plugin-typescript2": "0.31.2",