fix(deps): update dependency @netlify/serverless-functions-api to v1.28.0 (#537)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[@netlify/serverless-functions-api](https://redirect.github.com/netlify/serverless-functions-api)
| [`1.27.0` ->
`1.28.0`](https://renovatebot.com/diffs/npm/@netlify%2fserverless-functions-api/1.27.0/1.28.0)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@netlify%2fserverless-functions-api/1.28.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@netlify%2fserverless-functions-api/1.28.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@netlify%2fserverless-functions-api/1.27.0/1.28.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@netlify%2fserverless-functions-api/1.27.0/1.28.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v1.28.0`](https://redirect.github.com/netlify/serverless-functions-api/compare/96102c82f0df6cceadad8d4c97e00070d70847ec...4044c1d1b6033d1c31debd427313bbd4b9752f73)

[Compare
Source](https://redirect.github.com/netlify/serverless-functions-api/compare/96102c82f0df6cceadad8d4c97e00070d70847ec...4044c1d1b6033d1c31debd427313bbd4b9752f73)

</details>

---

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package-lock.json

@@ -79,7 +79,7 @@
     "test": "test"
   },
   "dependencies": {
-    "@netlify/serverless-functions-api": "1.27.0"
+    "@netlify/serverless-functions-api": "1.28.0"
   },
   "devDependencies": {
     "@arethetypeswrong/cli": "^0.16.0",