Bump apollo-server-core from 3.12.0 to 3.12.1 in /ts-tests (#1179)

Bumps [apollo-server-core](https://github.com/apollographql/apollo-server/tree/HEAD/packages/apollo-server-core) from 3.12.0 to 3.12.1.
- [Release notes](https://github.com/apollographql/apollo-server/releases)
- [Commits](https://github.com/apollographql/apollo-server/commits/[email protected]/packages/apollo-server-core)

---
updated-dependencies:
- dependency-name: apollo-server-core
  dependency-type: indirect
...

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