firmware: use python3 interpreter, not python

.github/workflows/build.yml

@@ -98,7 +98,7 @@ jobs:
       run: |
         brew tap armmbed/formulae
         brew install arm-none-eabi-gcc dfu-util
-        pip install PyYAML
+        pip3 install PyYAML
       if: matrix.os == 'macos-latest'
 
     - name: Install dependencies (Ubuntu)

firmware/hackrf-common.cmake

@@ -231,7 +231,7 @@ macro(DeclareTargets)
 		COMMAND rm -f _tmp.dfu _header.bin
 		COMMAND cp ${PROJECT_NAME}_dfu.bin _tmp.dfu
 		COMMAND dfu-suffix --vid=0x1fc9 --pid=0x000c --did=0x0 -a _tmp.dfu
-		COMMAND python ${PATH_DFU_PY} ${PROJECT_NAME}
+		COMMAND python3 ${PATH_DFU_PY} ${PROJECT_NAME}
 		COMMAND cat _header.bin _tmp.dfu >${PROJECT_NAME}.dfu
 		COMMAND rm -f _tmp.dfu _header.bin
 	)