Switch back to dppy/label/dev channel for coverage GH action

[antonwolfy]

The PR is continuation of #1761.
The Generate coverage GitHub action was previously switched to dppy/label/coverage channel temporary.
This PR is attempt to get rid of the work around.

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• Have you checked performance impact of proposed changes?
• If this PR is a work in progress, are you filing the PR as a draft?

[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/pull/1767/index.html

[antonwolfy]

Superseded by #1777