[turbolizer] Update rollup plugin for TypeScript

Change-Id: I8fee653d2e331c2e796115b4cb88a2138e456177
Bug: v8:7327
Notry: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528730Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Auto-Submit: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60305}

tools/turbolizer/package.json

@@ -17,7 +17,7 @@
     "d3": "^5.7.0",
     "rollup": "^0.68.2",
     "rollup-plugin-node-resolve": "^4.0.0",
-    "rollup-plugin-typescript2": "^0.19.3"
+    "rollup-plugin-typescript2": "^0.20.1"
   },
   "repository": {
     "type": "git",