Bump terser-webpack-plugin from 5.2.5 to 5.3.0 in /glean

Bumps [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) from 5.2.5 to 5.3.0.
- [Release notes](https://github.com/webpack-contrib/terser-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack/terser-webpack-plugin@v5.2.5...v5.3.0)

---
updated-dependencies:
- dependency-name: terser-webpack-plugin
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]