build(deps): bump apollo-server-core from 2.19.0 to 2.26.2 (#69)

Bumps [apollo-server-core](https://github.com/apollographql/apollo-server/tree/HEAD/packages/apollo-server-core) from 2.19.0 to 2.26.2.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/apollographql/apollo-server/commit/8fbc66cded6549d5a61433c9fed26775e60e0648"><code>8fbc66c</code></a> Release</li>
<li><a href="https://github.com/apollographql/apollo-server/commit/f01644642b4b08aa006247f5928d7485bdd8af65"><code>f016446</code></a> fixup tests missing graphRef</li>
<li><a href="https://github.com/apollographql/apollo-server/commit/f0c84d434448ba7f25bd134af25a25adef66a939"><code>f0c84d4</code></a> Merge pull request from GHSA-j5g3-5c8r-7qfx</li>
<li><a href="https://github.com/apollographql/apollo-server/commit/84852fcfb40bc5ea83c341dba546464d6114d7ed"><code>84852fc</code></a> Release</li>
<li><a href="https://github.com/apollographql/apollo-server/commit/a2b8fc6f93f9a188d0a2d41d4a86824f27178287"><code>a2b8fc6</code></a> Update dependency on graphql-upload fork to fix <a href="https://github.com/apollographql/apollo-server/tree/HEAD/packages/apollo-server-core/issues/7060">#7060</a></li>
<li><a href="https://github.com/apollographql/apollo-server/commit/91de501bb389c07ccfc5e684811153267b91e9ac"><code>91de501</code></a> Release</li>
<li><a href="https://github.com/apollographql/apollo-server/commit/ae444b2916deb2fa37dbd8fa091201235dc2ec6d"><code>ae444b2</code></a> Release</li>
<li><a href="https://github.com/apollographql/apollo-server/commit/82d44985ddca8e61557957d67f41e9c1a705a5ca"><code>82d4498</code></a> Disable graphql-upload integration when it is not used (<a href="https://github.com/apollographql/apollo-server/tree/HEAD/packages/apollo-server-core/issues/6476">#6476</a>)</li>
<li><a href="https://github.com/apollographql/apollo-server/commit/a725306525a99650af46effb72ae9afe780ed88b"><code>a725306</code></a> Release</li>
<li><a href="https://github.com/apollographql/apollo-server/commit/5069bd81092ceb6e868535a59561017a68803914"><code>5069bd8</code></a> apollo-server-core: update GraphQL Playground React app</li>
<li>Additional commits viewable in <a href="https://github.com/apollographql/apollo-server/commits/[email protected]/packages/apollo-server-core">compare view</a></li>
</ul>
</details>
<details>
<summary>Maintainer changes</summary>
<p>This version was pushed to npm by <a href="https://www.npmjs.com/~apollo-bot">apollo-bot</a>, a new releaser for apollo-server-core since your current version.</p>
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