Update Express to 4.21.1

[WilliamForbesJr]

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Description

• Update Express from 4.20.0 to 4.21.1

Resolves: #7936

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[Jens-Rydholm-Humly]

Is there a plan for merging this PR? Asking because express 4.21.1 fixes a security issue by updating cookie.

[glasser]

This PR only updates the version of express used when operating in this repo/running CI/etc; it doesn't actually update the dependency of the published @apollo/server on express. I'll make a new PR.