Rename datasets coverage artifact (#6233)

#6224 changed the version of the upload/download-artifact action we use
in our CI. However, v4 no longer allows multiple artifacts with the same
name. This caused failures for the `data-tests` when the full CI suite
is run as the coverage artifact is called `data-coverage`, but the tests
run twice (once for python 3.9, once for python 3.10).

This PR just adds the python version of the tests to the artifact name.

---------

Co-authored-by: Christina Lee <christina@xanadu.ai>

.github/workflows/interface-unit-tests.yml

@@ -508,7 +508,7 @@ jobs:
     with:
       job_name: data-tests (${{ matrix.python-version }})
       branch: ${{ inputs.branch }}
-      coverage_artifact_name: data-coverage
+      coverage_artifact_name: data-coverage-${{ matrix.python-version }}
       python_version: ${{ matrix.python-version }}
       pipeline_mode: ${{ inputs.pipeline_mode }}
       install_jax: false