Bump apollo-server-core in /frontend/points-hack-april20

Bumps [apollo-server-core](https://github.com/apollographql/apollo-server/tree/HEAD/packages/apollo-server-core) from 2.11.0 to 2.21.0.
- [Release notes](https://github.com/apollographql/apollo-server/releases)
- [Changelog](https://github.com/apollographql/apollo-server/blob/main/CHANGELOG.md)
- [Commits](https://github.com/apollographql/apollo-server/commits/apollo-server-core@2.21.0/packages/apollo-server-core)

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