Node engine version changed outside of major version

A transitive dependency, @apollo/federation changed its `engines` field to drop Node 10, but there was not a corresponding Breaking Change on the `apollo` root package. Narrowing the supported version range for a package is not a semver-compatible change.

https://github.com/apollographql/federation/blob/main/federation-js/CHANGELOG.md#v0210

This is bit confusing with 0.x versions (any change to x can be breaking); I would suggest releasing the federation module as a 1.0.0 since it is widely installed in production.

Start with the linked @apollo/federation CHANGELOG entry for v0.21.0 and inspect how the apollo root package records dependency engine changes. Determine the intended semver and breaking-change treatment for dropping Node 10; the work is done when the package metadata and release communication follow the agreed policy.

Written by the indexing model from the issue text.