Use a requirement file to install dpctl wheel package

[antonwolfy]

The PR proposes to use a requirement file while installing dpctl wheel package through GitHub actions in Build docs and Coverage workflows.
This will allow to specified the required dpctl version in one requirement file.

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/index.html

[coveralls]

coverage: 72.271%. remained the same
when pulling 0a9886e on use-req-file-for-dpctl-pkg
into 43095fb on master.

[github-actions]

Array API standard conformance tests for dpnp=0.18.0dev0=py312he4f9c94_72 ran successfully.
Passed: 1215
Failed: 0
Skipped: 14

[antonwolfy]

The failing wheel tests in the internal CI are unrelating.