chore(deps): update dependency graphql-http to v1.21.0 (#7659)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [graphql-http](https://togithub.com/graphql/graphql-http) | [`1.20.0`
->
`1.21.0`](https://renovatebot.com/diffs/npm/graphql-http/1.20.0/1.21.0)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/graphql-http/1.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/graphql-http/1.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/graphql-http/1.20.0/1.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>graphql/graphql-http (graphql-http)</summary>

###
[`v1.21.0`](https://togithub.com/graphql/graphql-http/blob/HEAD/CHANGELOG.md#1210-2023-07-17)

[Compare
Source](https://togithub.com/graphql/graphql-http/compare/v1.20.0...v1.21.0)

##### Bug Fixes

- **client:** `graphql` module is not required for runtime
([#&#8203;102](https://togithub.com/graphql/graphql-http/issues/102))
([9049f31](https://togithub.com/graphql/graphql-http/commit/9049f31c0c9226e3c07f798d8ef01eff95139c87))

##### Features

- Use Netlify Functions
([#&#8203;96](https://togithub.com/graphql/graphql-http/issues/96))
([2b1ab14](https://togithub.com/graphql/graphql-http/commit/2b1ab142e32b524f4ac9a81b0a30bf0333f98761))

</details>

---

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.changeset/tough-buttons-sniff.md

@@ -0,0 +1,6 @@
+---
+'@apollo/server-integration-testsuite': patch
+'@apollo/server': patch
+---
+
+Update graphql-http dependency

packages/integration-testsuite/package.json

@@ -35,7 +35,7 @@
     "@josephg/resolvable": "^1.0.1",
     "body-parser": "^1.20.0",
     "express": "^4.18.1",
-    "graphql-http": "1.20.0",
+    "graphql-http": "1.21.0",
     "graphql-tag": "^2.12.6",
     "loglevel": "^1.8.0",
     "node-fetch": "^2.6.7",