test: Use random_sample instead of ndarray for random array in OpenSearchDocumentStore test

[bogdankostic]

Related Issues

• fixes test__get_vector_similarity_query_support_true and test__get_vector_similarity_query_support_false for OpenSearchDocumentStore are flaky #3082

Proposed Changes:

This PR makes a small change to TestOpenSearchDocumentStore by creating query_emb using np.random.random_sample instead of numpy.ndaray. This makes sure that there are no nan values in query_emb.

How did you test it?

I let the tests for OpenSearchDocumentStore run.

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added tests that demonstrate the correct behavior of the change
• I've used the conventional commit convention for my PR title
• I documented my code
• I ran pre-commit hooks and fixed any issue

[vblagoje]

Good find @bogdankostic