Bump ts-loader from 8.1.0 to 9.0.0 in /samples/web-extension/typescript

Bumps [ts-loader](https://github.com/TypeStrong/ts-loader) from 8.1.0 to 9.0.0.
- [Release notes](https://github.com/TypeStrong/ts-loader/releases)
- [Changelog](https://github.com/TypeStrong/ts-loader/blob/main/CHANGELOG.md)
- [Commits](TypeStrong/ts-loader@v8.1.0...v9.0.0)

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Author: dependabot[bot]