Bump webpack from 5.20.2 to 5.21.2 (#329)

Bumps [webpack](https://github.com/webpack/webpack) from 5.20.2 to 5.21.2.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v5.20.2...v5.21.2)

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package.json

@@ -49,7 +49,7 @@
         "tfx-cli": "^0.8.3",
         "ts-loader": "^8.0.15",
         "typescript": "^4.1.3",
-        "webpack": "^5.20.2",
+        "webpack": "^5.21.2",
         "webpack-cli": "^4.5.0"
     }
 }