chore(deps): update dependency apollo-server-express to v2.11.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
apollo-server-express	devDependencies	minor	2.10.1 -> 2.11.0

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Release Notes

apollographql/apollo-server

v2.11.0

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• The range of accepted peerDepedencies versions for graphql has been widened to include graphql@^15.0.0-rc.2 so as to accommodate the latest release-candidate of the graphql@15 package, and an intention to support it when it is finally released on the latest npm tag. While this change will subdue peer dependency warnings for Apollo Server packages, many dependencies from outside of this repository will continue to raise similar warnings until those packages own peerDependencies are updated. It is unlikely that all of those packages will update their ranges prior to the final version of graphql@15 being released, but if everything is working as expected, the warnings can be safely ignored. PR #​3825

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