fix(deps): update dependency @netlify/serverless-functions-api to v1.9.1 (#434)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[@netlify/serverless-functions-api](https://togithub.com/netlify/serverless-functions-api)
| [`1.9.0` ->
`1.9.1`](https://renovatebot.com/diffs/npm/@netlify%2fserverless-functions-api/1.9.0/1.9.1)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@netlify%2fserverless-functions-api/1.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@netlify%2fserverless-functions-api/1.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|
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|

---

### Release Notes

<details>
<summary>netlify/serverless-functions-api
(@&#8203;netlify/serverless-functions-api)</summary>

###
[`v1.9.1`](https://togithub.com/netlify/serverless-functions-api/blob/HEAD/CHANGELOG.md#191-2023-10-12)

[Compare
Source](https://togithub.com/netlify/serverless-functions-api/compare/v1.9.0...v1.9.1)

##### Bug Fixes

- write empty string to stream when body is null
([#&#8203;164](https://togithub.com/netlify/serverless-functions-api/issues/164))
([dda59e0](https://togithub.com/netlify/serverless-functions-api/commit/dda59e02e466e9c2468051d972112448fa012d35))

</details>

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package-lock.json

@@ -53,7 +53,7 @@
     "test": "test"
   },
   "dependencies": {
-    "@netlify/serverless-functions-api": "1.9.0",
+    "@netlify/serverless-functions-api": "1.9.1",
     "is-promise": "^4.0.0"
   },
   "devDependencies": {