Bump apollo-server from 2.4.8 to 2.25.4 in /server

Bumps [apollo-server](https://github.com/apollographql/apollo-server/tree/HEAD/packages/apollo-server) from 2.4.8 to 2.25.4.
- [Release notes](https://github.com/apollographql/apollo-server/releases)
- [Changelog](https://github.com/apollographql/apollo-server/blob/apollo-server@2.25.4/CHANGELOG.md)
- [Commits](https://github.com/apollographql/apollo-server/commits/apollo-server@2.25.4/packages/apollo-server)

---
updated-dependencies:
- dependency-name: apollo-server
  dependency-type: direct:production
...

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