samples: net: wpan_serial: Excluding nucleo_wba65ri platform

As CONFIG_BUILD_ONLY_NO_BLOBS feature is not implemented for
stm32wbax socs, we have temporarily excluded
nucleo_wba65ri platform from CI build tests.

Issue #95495
will be updated accordingly

Signed-off-by: Alessandro Manganaro <alessandro.manganaro@st.com>

Author: asm5878

samples/net/wpan_serial/sample.yaml

@@ -15,6 +15,7 @@ tests:
       - thingy53/nrf5340/cpuapp/ns
       - raytac_mdbt53_db_40/nrf5340/cpuapp/ns
       - raytac_mdbt53_db_40/nrf5340/cpuapp
+      - nucleo_wba65ri
     integration_platforms:
       - usb_kw24d512
   sample.net.wpan_serial.frdm_cr20a: