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/apollo-server-core@2.19.0/packages/apollo-server-core)

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Author: dependabot[bot]