[Security] Bump apollo-server-express from 2.9.7 to 2.19.0 in /webapp

Bumps [apollo-server-express](https://github.com/apollographql/apollo-server/tree/HEAD/packages/apollo-server-express) from 2.9.7 to 2.19.0. **This update includes a security fix.**
- [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-express@2.19.0/packages/apollo-server-express)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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dependabot-preview[bot] 2020-11-20 20:11:51 +00:00 committed by GitHub
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commit c217065612
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