Bump apollo-server from 2.9.0 to 2.9.1 in /backend

Created by: Tirokk

Authored by dependabot-preview[bot] Aug 29, 2019 Merged Aug 29, 2019

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Bumps apollo-server from 2.9.0 to 2.9.1.

Changelog

Sourced from apollo-server's changelog.

v2.9.1

See complete versioning details.

• apollo-server-core: Make formatError available to subscriptions in the same spirit as the existing formatResponse. [PR #2942](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2942)
• apollo-engine-reporting: The behavior of the engine.maxAttempts parameter previously did not match its documentation. It is documented as being the max number of attempts including the initial attempt, but until this release it was actually the number of retries excluding the initial attempt. The behavior has been changed to match the documentation (and the literal reading of the option name). [PR #3218](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/3218)
• apollo-engine-reporting: When sending the report fails with a server-side 5xx error, include the full error from the server in the logs. [PR #3218](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/3218)
• apollo-server-core: Fix regression which prevented the resizing of the schema panel in GraphQL Playground. [PR #3224](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/3224) and upstream

Commits

• 029c8dc Publish
• 9b980e6 Backfill references to publish commits for federation and gateway changelogs
• abdec21 Update Playground to fix #2529. (#3224)
• f39fde9 chore(deps): update dependency gatsby-theme-apollo-docs to v2.0.2 (#3221)
• 4c658c0 Update changelog with missing entry
• 1852033 Fix value type behavior within composition and execution (#3182)
• 1edfa2c Make service definition cache local to ApolloGateway object (#3191)
• cca7433 chore(deps): pin dependencies (#3220)
• e151191 Validate variables at the gateway level (#3213)
• a0290c2 Merge pull request #3219 from apollographql/theme-v2
• Additional commits viewable in compare view

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