Update build.yml

Add Pro Micro RP2040 to build.yml.

Author: spe2

.github/workflows/build.yml

@@ -314,6 +314,7 @@ jobs:
         - "sparkfun_lumidrive"
         - "sparkfun_nrf52840_micromod"
         - "sparkfun_nrf52840_mini"
+        - "sparkfun_pro_micro_rp2040"
         - "sparkfun_qwiic_micro_no_flash"
         - "sparkfun_qwiic_micro_with_flash"
         - "sparkfun_redboard_turbo"