Fix zarr installation order to collect more tests

Author: agriyakhetarpal

.github/workflows/ci-emscripten.yaml

@@ -81,13 +81,13 @@ jobs:
           pyodide venv .venv-pyodide
           source .venv-pyodide/bin/activate
 
+          # For tests in test_zarr3.py
+          pip install zarr
+
           # Install the built numcodecs WASM wheel and relevant dependencies
           pip install $(ls dist/*.whl)"[msgpack,crc32c,test,test_extras]"
           # TODO: get zfpy built in Pyodide and install it here
 
-          # For tests in test_zarr3.py
-          pip install zarr
-
           # Change into a different directory before running tests to avoid
           # the test runner picking up the local numcodecs package
           cd docs