Update Terraform netbox to v3.8.0 (#12)

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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://github.com/e-breuninger/terraform-provider-netbox))
| required_provider | minor | `3.7.6` -> `3.8.0` |

---

### Release Notes

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

###
[`v3.8.0`](https://github.com/e-breuninger/terraform-provider-netbox/blob/HEAD/CHANGELOG.md#380-January-30th-2024)

[Compare
Source](https://github.com/e-breuninger/terraform-provider-netbox/compare/v3.7.7...v3.8.0)

**BREAKING CHANGES**
Due to a change in NetBox 3.7's behavior regarding Webhooks and the
corresponding changes in the API,
the `netbox_webhook` resource might cause problems with NetBox versions
older than 3.7.0.
For all other resources and data sources, the provider should still
perform fine with older NetBox versions.

- resource/netbox_webhook: Removed `enabled`, `trigger_on_create`,
`trigger_on_update`, `trigger_on_delete`, `content_types` and
`conditions`

ENHANCEMENTS

-   provider: Now officially supports NetBox 3.7
-   **New Resource:** `netbox_event_rule`

###
[`v3.7.7`](https://github.com/e-breuninger/terraform-provider-netbox/blob/HEAD/CHANGELOG.md#377-January-30th-2024)

[Compare
Source](https://github.com/e-breuninger/terraform-provider-netbox/compare/v3.7.6...v3.7.7)

BUG FIXES

- resource/netbox_device: Fix Virtual Chassis Master Update Function for
Tag Input
([#&#8203;532](https://github.com/e-breuninger/terraform-provider-netbox/pull/532)
by [@&#8203;adelekanley](https://github.com/adelekanley))

</details>

---

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terraform/providers.tf

@@ -2,7 +2,7 @@ terraform {
   required_providers {
     netbox = {
       source  = "e-breuninger/netbox"
-      version = "3.7.6"
+      version = "3.8.0"
     }
     proxmox = {
       source  = "Telmate/proxmox"