Bump ts-loader from 8.0.14 to 8.0.18 in /assets

Bumps [ts-loader](https://github.com/TypeStrong/ts-loader) from 8.0.14 to 8.0.18.
- [Release notes](https://github.com/TypeStrong/ts-loader/releases)
- [Changelog](https://github.com/TypeStrong/ts-loader/blob/master/CHANGELOG.md)
- [Commits](TypeStrong/ts-loader@v8.0.14...v8.0.18)

Signed-off-by: dependabot[bot] <support@github.com>

assets/package.json

@@ -36,7 +36,7 @@
     "mini-css-extract-plugin": "^1.3.4",
     "optimize-css-assets-webpack-plugin": "^5.0.4",
     "terser-webpack-plugin": "^5.1.1",
-    "ts-loader": "^8.0.14",
+    "ts-loader": "^8.0.18",
     "typescript": "^4.1.3",
     "webpack": "5.15.0",
     "webpack-cli": "^4.3.1"