build(deps): bump apollo-server-core from 2.12.0 to 2.19.0

Bumps [apollo-server-core](https://github.com/apollographql/apollo-server/tree/HEAD/packages/apollo-server-core) from 2.12.0 to 2.19.0.
- [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/[email protected]/packages/apollo-server-core)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]