Update arduino_test_runner.yml

Author: ripred

.github/workflows/arduino_test_runner.yml

@@ -17,11 +17,10 @@ jobs:
       - name: Install arduino_ci gem
         run: |
           gem install arduino_ci
-          echo "$(ruby -e 'print Gem.bindir')" >> $GITHUB_PATH
-          export PATH="$PATH:$(ruby -e 'print Gem.bindir')"
-
+          echo "$(ruby -e 'print Gem.bindir')" >> $GITHUB_ENV
+      
       - name: Verify arduino_ci installation
         run: arduino_ci --version
-
+      
       - name: Run Arduino CI tests
         run: arduino_ci