build(deps): update terraform vercel to v2.9.0 (#4839)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [vercel](https://registry.terraform.io/providers/vercel/vercel)
([source](https://redirect.github.com/vercel/terraform-provider-vercel))
| required_provider | minor | `2.8.0` -> `2.9.0` |

---

### Release Notes

<details>
<summary>vercel/terraform-provider-vercel (vercel)</summary>

###
[`v2.9.0`](https://redirect.github.com/vercel/terraform-provider-vercel/releases/tag/v2.9.0)

[Compare
Source](https://redirect.github.com/vercel/terraform-provider-vercel/compare/v2.8.0...v2.9.0)

#### Changelog

-
[`d8ba138`](https://redirect.github.com/vercel/terraform-provider-vercel/commit/d8ba1386cf333a4379547df32b3f58763dc142c5):
\[Firewall Config] Support values in conditions
([#&#8203;257](https://redirect.github.com/vercel/terraform-provider-vercel/issues/257))
([@&#8203;sueplex](https://redirect.github.com/sueplex))
-
[`8594dc6`](https://redirect.github.com/vercel/terraform-provider-vercel/commit/8594dc60dff56e84e024080c0e494d21c5e318ac):
Create Firewall Bypass rule
([#&#8203;254](https://redirect.github.com/vercel/terraform-provider-vercel/issues/254))
([@&#8203;sueplex](https://redirect.github.com/sueplex))
-
[`bb4cd02`](https://redirect.github.com/vercel/terraform-provider-vercel/commit/bb4cd0268a25f2c7debd3f852bff47b805a47590):
Upgrade environment variables API to v10
([#&#8203;260](https://redirect.github.com/vercel/terraform-provider-vercel/issues/260))
([@&#8203;dglsparsons](https://redirect.github.com/dglsparsons))

</details>

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terraform/versions.tf

@@ -7,7 +7,7 @@ terraform {
 
     vercel = {
       source  = "vercel/vercel"
-      version = "2.8.0"
+      version = "2.9.0"
     }
   }