docs: bump branching product stage to beta (supabase#36508)

Author: sweatybridge

apps/docs/content/guides/getting-started/features.mdx

@@ -208,7 +208,7 @@ In addition to the Beta requirements, features in GA are covered by the [uptime
 | Platform       | Custom Domains             | `GA`            | N/A                                         |
 | Platform       | Network Restrictions       | `beta`          | N/A                                         |
 | Platform       | SSL enforcement            | `GA`            | N/A                                         |
-| Platform       | Branching                  | `public alpha`  | N/A                                         |
+| Platform       | Branching                  | `beta`          | N/A                                         |
 | Platform       | Terraform Provider         | `public alpha`  | N/A                                         |
 | Platform       | Read Replicas              | `private alpha` | N/A                                         |
 | Platform       | Log Drains                 | `public alpha`  | ✅                                          |