Bump @symfony/webpack-encore from 1.8.2 to 2.1.0

Bumps [@symfony/webpack-encore](https://github.com/symfony/webpack-encore) from 1.8.2 to 2.1.0.
- [Release notes](https://github.com/symfony/webpack-encore/releases)
- [Changelog](https://github.com/symfony/webpack-encore/blob/main/CHANGELOG.md)
- [Commits](symfony/webpack-encore@v1.8.2...v2.1.0)

---
updated-dependencies:
- dependency-name: "@symfony/webpack-encore"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]