Update Terraform netbox to v3.9.0 (#28)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [netbox](https://registry.terraform.io/providers/e-breuninger/netbox)
([source](https://togithub.com/e-breuninger/terraform-provider-netbox))
| required_provider | minor | `3.8.9` -> `3.9.0` |
| [netbox](https://registry.terraform.io/providers/e-breuninger/netbox)
([source](https://togithub.com/e-breuninger/terraform-provider-netbox))
| required_provider | minor | `~> 3.8.0` -> `~> 3.9.0` |

---

### Release Notes

<details>
<summary>e-breuninger/terraform-provider-netbox (netbox)</summary>

###
[`v3.9.0`](https://togithub.com/e-breuninger/terraform-provider-netbox/releases/tag/v3.9.0)

[Compare
Source](https://togithub.com/e-breuninger/terraform-provider-netbox/compare/v3.8.9...v3.9.0)

#### 3.9.0 (August 10th, 2024)

ENHANCEMENTS

-   provider: Now is tested against (= supports) the NetBox 4.0.x range.

</details>

---

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Marcus Weiner <[email protected]>

modules/available_interfaces/providers.tf

@@ -2,7 +2,7 @@ terraform {
   required_providers {
     netbox = {
       source  = "e-breuninger/netbox"
-      version = "~> 3.8.0"
+      version = "~> 3.9.0"
     }
   }
 }

modules/device/providers.tf

@@ -2,7 +2,7 @@ terraform {
   required_providers {
     netbox = {
       source  = "e-breuninger/netbox"
-      version = "~> 3.8.0"
+      version = "~> 3.9.0"
     }
   }
 }

providers.tf

@@ -2,7 +2,7 @@ terraform {
   required_providers {
     netbox = {
       source  = "e-breuninger/netbox"
-      version = "3.8.9"
+      version = "3.9.0"
     }
   }
 }