build(deps): bump nth-check and optimize-css-assets-webpack-plugin

Bumps [nth-check](https://github.com/fb55/nth-check) and [optimize-css-assets-webpack-plugin](https://github.com/NMFR/optimize-css-assets-webpack-plugin). These dependencies needed to be updated together. Updates `nth-check` from 1.0.2 to 2.1.1 - [Release notes](https://github.com/fb55/nth-check/releases) - [Commits](fb55/nth-check@v1.0.2...v2.1.1) Updates `optimize-css-assets-webpack-plugin` from 5.0.8 to 6.0.1 - [Release notes](https://github.com/NMFR/optimize-css-assets-webpack-plugin/releases) - [Commits](NMFR/optimize-css-assets-webpack-plugin@v5.0.8...v6.0.1) --- updated-dependencies: - dependency-name: nth-check dependency-type: indirect - dependency-name: optimize-css-assets-webpack-plugin dependency-type: direct:development ... Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]