fix(deps): update dependency @netlify/serverless-functions-api to v1.13.0 (#451)

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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)
| [`1.12.3` ->
`1.13.0`](https://renovatebot.com/diffs/npm/@netlify%2fserverless-functions-api/1.12.3/1.13.0)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@netlify%2fserverless-functions-api/1.13.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@netlify%2fserverless-functions-api/1.13.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@netlify%2fserverless-functions-api/1.12.3/1.13.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

---

### Release Notes

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

###
[`v1.13.0`](https://togithub.com/netlify/serverless-functions-api/compare/4a545e7aaa2bf2e13eecb2a3fe598ee2b7fabf6a...4b8323b28aebfbcb529d5c895edaaf01610aeb4c)

[Compare
Source](https://togithub.com/netlify/serverless-functions-api/compare/4a545e7aaa2bf2e13eecb2a3fe598ee2b7fabf6a...4b8323b28aebfbcb529d5c895edaaf01610aeb4c)

</details>

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package-lock.json

@@ -53,7 +53,7 @@
     "test": "test"
   },
   "dependencies": {
-    "@netlify/serverless-functions-api": "1.12.3",
+    "@netlify/serverless-functions-api": "1.13.0",
     "is-promise": "^4.0.0"
   },
   "devDependencies": {