Update dependency @apollo/client to v3.0.0-rc.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@apollo/client (source)	devDependencies	patch	3.0.0-rc.4 -> 3.0.0-rc.6

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Release Notes

apollographql/apollo-client

### [`v3.0.0-rc.6`](https://togithub.com/apollographql/apollo-client/compare/v3.0.0-rc.5...v3.0.0-rc.6) [Compare Source](https://togithub.com/apollographql/apollo-client/compare/v3.0.0-rc.5...v3.0.0-rc.6) ### [`v3.0.0-rc.5`](https://togithub.com/apollographql/apollo-client/compare/v3.0.0-rc.4...v3.0.0-rc.5) [Compare Source](https://togithub.com/apollographql/apollo-client/compare/v3.0.0-rc.4...v3.0.0-rc.5)

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