add: encode header Content-Type graphql-response

[aro-lew]

This change adds application/graphql-response+json* to the list of default encoded header Content-Types. According to the GraphQL specification, GraphQL responses should be served with this content type. Adding it to the default encoded headers ensures proper handling and encoding of GraphQL responses.

Note:
If this is merged, the website should be updated accordingly to reflect the new header type.

[CLAassistant]

All committers have signed the CLA.

[mholt]

Thanks for the PR. I don't use GraphQL so I'll trust you've tested it. :)

This PR is missing our new assistance disclosure btw -- when I go to make a PR, it's working (it shows up for me as a PR template). Did you not see the template when you created the PR?

[aro-lew]

Yes, the template did show up. I got a bit confused and deleted it — sorry about that! Here’s the missing part:

Assistance Disclosure

I consulted ChatGPT for a solution, but I coded it myself.

[mholt]

Thanks, just wondering since it's still new. (Anything we could do to make it less confusing?)