Install selenium for safari tests emscripten.yml

Author: mcbarton

.github/workflows/emscripten.yml

@@ -565,6 +565,7 @@ jobs:
           echo "Running DynamicLibraryManagerTests in Google Chrome"          
           emrun --browser="Google Chrome" --kill_exit --timeout 60 --browser-args="--headless --no-sandbox"  DynamicLibraryManagerTests.html
           sudo safaridriver --enable
+          python -m pip install selenium
           echo "Running CppInterOpTests in Safari"
           emrun --no_browser --kill_exit --timeout 60 --browser-args="--headless --no-sandbox"  CppInterOpTests.html &
           python browser_tests_safari.py CppInterOpTests.html