Add BFF v4 to supported versions table

Author: maartenba

src/content/docs/general/support-and-issues.mdx

@@ -88,6 +88,8 @@ The following table tracks release and end of support dates for Duende products.
 |                          |                   | .NET 6                   | November 12, 2024   |
 | Duende IdentityServer v5 | January 14, 2021  | .NET 5                   | May 10, 2022        |
 |                          |                   | .NET Core 3.1            | December 13, 2022   |
+| Duende BFF v4            | TBD,      2025    | .NET 9                   | May 12, 2026        |
+|                          |                   | .NET 8                   | November 10, 2026   |
 | Duende BFF v3            | March 17, 2025    | .NET 9                   | May 12, 2026        |
 |                          |                   | .NET 8                   | November 10, 2026   |
 | Duende BFF v2            | November 11, 2022 | .NET 9                   | May 12, 2026        |