Update accept header used with GraphQL17Alpha9Handler

[jerelmiller]

Updates the header based on changes in apollographql/apollo-server#8148

[changeset-bot]

🦋 Changeset detected

Latest commit: 5db41bb

The changes in this PR will be included in the next version bump.

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[pkg-pr-new]

npm i https://pkg.pr.new/apollographql/apollo-client/@apollo/client@12973

commit: 5db41bb

[apollo-librarian]

✅ Docs preview ready

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File Changes

0 new, 10 changed, 0 removed

* (developer-tools)/react/(latest)/caching/cache-configuration.mdx
* (developer-tools)/react/(latest)/data/fragments.mdx
* (developer-tools)/react/(latest)/data/mutations.mdx
* (developer-tools)/react/(latest)/data/persisted-queries.mdx
* (developer-tools)/react/(latest)/data/queries.mdx
* (developer-tools)/react/(latest)/integrations/react-native.mdx
* (developer-tools)/react/(latest)/migrating/apollo-client-4-migration.mdx
* (developer-tools)/react/(latest)/performance/server-side-rendering.mdx
* (developer-tools)/react/(latest)/VERSIONING_POLICY.md
* (developer-tools)/react/(latest)/versioning-policy.md

Build ID: 71fc3e2dd5f4a94307d6e456
Build Logs: View logs

URL: https://www.apollographql.com/docs/deploy-preview/71fc3e2dd5f4a94307d6e456

[phryneas]

If that's the final naming scheme - approved :)