build(deps): bump apollo-server from 2.25.3 to 2.26.0 in /tests/solid…

…ity (#1376)

Bumps [apollo-server](https://github.com/apollographql/apollo-server/tree/HEAD/packages/apollo-server) from 2.25.3 to 2.26.0.
- [Release notes](https://github.com/apollographql/apollo-server/releases)
- [Changelog](https://github.com/apollographql/apollo-server/blob/apollo-server@2.26.0/CHANGELOG.md)
- [Commits](https://github.com/apollographql/apollo-server/commits/apollo-server@2.26.0/packages/apollo-server)

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

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