try to fix adafruit-nrfutil bin being in path?

.github/workflows/main.yml

@@ -21,6 +21,6 @@ jobs:
           pip install -U platformio
       - name: Install extra python tools
         run: |          
-          pip3 install --user adafruit-nrfutil
+          pip install -U adafruit-nrfutil
       - name: Build
         run: platformio run -e tbeam -e heltec -e nrf52840dk -e feather_nrf52832