Update release.yml

Author: jonasniesner

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Copy Production Firmware
         run: |
           mkdir firmware_output
-          cp .pio/build/oeplnrf/production.hex firmware_output/production.hex
+          cp .pio/build/oeplnrf/firmware.hex firmware_output/production.hex
 
       - name: Rename Files with Release Tag
         run: |