mcux: connectivity_framework: update component version

Update README with the correct version for the connectivity_framework.

Author: axelnxp

mcux/README

@@ -12,7 +12,7 @@ Origin:
 
    NXP MCUXpresso SDK Connectivity Framework
    https://github.com/nxp-mcuxpresso/mcux-sdk-middleware-connectivity-framework
-   BRANCH: release/25.06.00
+   BRANCH: release/25.09.00
 
    NXP MCUXpresso SDK Bluetooth Controller
    https://github.com/nxp-mcuxpresso/mcuxsdk-middleware-bluetooth-controller