Bump d3-geo-projection from 2.7.1 to 2.8.1
Bump d3-geo-projection from 2.7.1 to 2.8.1

Bumps [d3-geo-projection](https://github.com/d3/d3-geo-projection) from 2.7.1 to 2.8.1.
- [Release notes](https://github.com/d3/d3-geo-projection/releases)
- [Commits](https://github.com/d3/d3-geo-projection/compare/v2.7.1...v2.8.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
vega/vega,vega/vega,vega/vega,lgrammel/vega,vega/vega