tests: drivers: i2c: i2c_target_api add nucleo_f429zi

Adds nucleo_f429zi in i2c_target_api test case
to enables the board.

Signed-off-by: Marc Desvaux <[email protected]>

Author: Desvauxm-st

tests/drivers/i2c/i2c_target_api/testcase.yaml

@@ -14,6 +14,7 @@ tests:
       - stm32f072b_disco
       - nucleo_g071rb
       - nucleo_f207zg
+      - nucleo_f429zi
       - rpi_pico
     integration_platforms:
       - nucleo_f091rc