build(deps): bump apollo-server-core from 2.14.1 to 2.14.3

Bumps [apollo-server-core](https://github.com/apollographql/apollo-server) from 2.14.1 to 2.14.3.
- [Release notes](https://github.com/apollographql/apollo-server/releases)
- [Changelog](https://github.com/apollographql/apollo-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/apollographql/apollo-server/compare/apollo-server-core@2.14.1...apollo-server-core@2.14.3)

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