Bump browserslist from 4.14.5 to 4.19.3 (prebid#3600)

Bumps [browserslist](https://github.com/browserslist/browserslist) from 4.14.5 to 4.19.3.
- [Release notes](https://github.com/browserslist/browserslist/releases)
- [Changelog](https://github.com/browserslist/browserslist/blob/main/CHANGELOG.md)
- [Commits](browserslist/browserslist@4.14.5...4.19.3)

---
updated-dependencies:
- dependency-name: browserslist
  dependency-type: indirect
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>