Update BRANCHES.md

Signed-off-by: Dave Rodgman <[email protected]>

Author: daverodgman

BRANCHES.md

@@ -106,6 +106,6 @@ The following branches are currently maintained:
 - [`development`](https://github.com/Mbed-TLS/mbedtls/)
 - [`mbedtls-2.28`](https://github.com/Mbed-TLS/mbedtls/tree/mbedtls-2.28)
  maintained until at least the end of 2024, see
-  <https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.6>.
+  <https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.7>.
 
 Users are urged to always use the latest version of a maintained branch.