fix(deps): update apollo graphql packages

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
apollo-server-express	dependencies	minor	2.15.0 -> 2.16.0
graphql-tag	dependencies	patch	2.10.3 -> 2.10.4

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Release Notes

apollographql/apollo-server

### [`v2.16.0`](https://togithub.com/apollographql/apollo-server/blob/master/CHANGELOG.md#v2160) [Compare Source](https://togithub.com/apollographql/apollo-server/compare/8cfc947ed56fa3f32b82b32b4bcca53470712984...f4cfb22b93913c98e54c638ae39f39ed153daf66) - `apollo-server-fastify`: Pass Fastify's `request` and `reply` objects into the `context` function, which previously had been receiving nothing. [Issue #​3156](https://togithub.com/apollographql/apollo-server/issues/3156) \[PR [#​3895](https://togithub.com/apollographql/apollo-server/issues/3895)([#​3895](https://togithub.com/apollographql/apollo-server/pull/3895)) - `apollo-server-lamdbda`: Automatically decode payloads which are Base64-encoded when the `isBase64Encoded` boolean is present on Lambda `event` payloads. [PR #​4311](https://togithub.com/apollographql/apollo-server/pull/4311) ### [`v2.15.1`](https://togithub.com/apollographql/apollo-server/blob/master/CHANGELOG.md#v2151) [Compare Source](https://togithub.com/apollographql/apollo-server/compare/6f7bdc6099669728926ea88f6317cb17cc6a4b43...8cfc947ed56fa3f32b82b32b4bcca53470712984) - The default branch of the repository has been changed to `main`. As this changed a number of references in the repository's `package.json` and `README.md` files (e.g., for badges, links, etc.), this necessitates a release to publish those changes to npm. [PR #​4302](https://togithub.com/apollographql/apollo-server/pull/4302)

apollographql/graphql-tag

### [`v2.10.4`](https://togithub.com/apollographql/graphql-tag/blob/master/CHANGELOG.md#v2104-2020-07-08) [Compare Source](https://togithub.com/apollographql/graphql-tag/compare/v2.10.3...a73bc250d8f3fdd1304c77d1102138171a29b266) - Bump dev/peer deps to accommodate `graphql` 15.
[@​adriencohen](https://togithub.com/adriencohen) in [#​299](https://togithub.com/apollographql/graphql-tag/pull/299)

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