Bump apollo-server-express from 2.9.6 to 2.9.7

[dependabot-preview[bot]]

Bumps apollo-server-express from 2.9.6 to 2.9.7.

Changelog

*Sourced from [apollo-server-express's changelog](https://github.com/apollographql/apollo-server/blob/master/CHANGELOG.md).* > ### v2.9.7 > > > [See complete versioning details.](https://github.com/apollographql/apollo-server/commit/5d94e986f04457ec17114791ee6db3ece4213dd8) > > - `apollo-server-errors`: Fix `ApolloError` bug and `GraphQLError` spec compliance [#3408](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/3408)

Commits

- [`5d94e98`](https://github.com/apollographql/apollo-server/commit/5d94e986f04457ec17114791ee6db3ece4213dd8) Release - [`2f62ff5`](https://github.com/apollographql/apollo-server/commit/2f62ff531f9c186d408de04ca4f292a21cccd79b) Update changelog - [`e57036a`](https://github.com/apollographql/apollo-server/commit/e57036acf0c5461c9dfabef5c3e79377ff86348a) Gateway - don't log updates on startup ([#3421](https://github-redirect.dependabot.com/apollographql/apollo-server/issues/3421)) - [`cdec277`](https://github.com/apollographql/apollo-server/commit/cdec277cb574e0ca3d3023cc1763eb2944f9412f) Revert "Update changelog" - [`38f245d`](https://github.com/apollographql/apollo-server/commit/38f245d311a23c6578837351591133be15d82fde) Update changelog - [`738e375`](https://github.com/apollographql/apollo-server/commit/738e375bfbf362f76cece4ea3d794574b3fbd536) Add CODEOWNERS for federation specifications - [`21a7853`](https://github.com/apollographql/apollo-server/commit/21a7853ce43733afcecb14c9debd491147243154) Gateway cached DataSource bug ([#3412](https://github-redirect.dependabot.com/apollographql/apollo-server/issues/3412)) - [`8800be9`](https://github.com/apollographql/apollo-server/commit/8800be9cc16203e60f7fef3deaaf60482baf4376) Fix typo in ISSUE_TEMPLATE.md ([#3417](https://github-redirect.dependabot.com/apollographql/apollo-server/issues/3417)) - [`5afec9c`](https://github.com/apollographql/apollo-server/commit/5afec9c856826bda233b80326242d81012674073) Gateway schema change listener bug + refactor ([#3411](https://github-redirect.dependabot.com/apollographql/apollo-server/issues/3411)) - [`6fcf0a4`](https://github.com/apollographql/apollo-server/commit/6fcf0a474e60f02ad4ff65ef4cd9efa0f21257dd) chore(deps): update dependency gatsby-theme-apollo-docs to v2.3.7 ([#3413](https://github-redirect.dependabot.com/apollographql/apollo-server/issues/3413)) - Additional commits viewable in [compare view](https://github.com/apollographql/apollo-server/compare/apollo-server-express@2.9.6...apollo-server-express@2.9.7)

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[dependabot-preview[bot]]

Looks like apollo-server-express is up-to-date now, so this is no longer needed.