Use new action for publishing

[CasperWA]

New publish workflow

I have jumbled together a Docker-based GitHub Action push-protected.

It's main purpose is to facilitate pushing to protected branches.
It will go through the following workflow:

1. Apply changes to the current state of the target protected branch (e.g., updating CHANGELOG.md).
2. Determine required checks for the target protected branch (e.g., master).
3. Create a dummy branch, which includes the applied changes.
   Push it so that the same required checks needed for the target protected branch are run on the dummy branch (these branches are named: push-action/<run ID>/<UUID>, where <run ID> is the current Action workflow run's ID).
4. Wait for all required checks to pass on dummy branch.
5. Merge dummy branch into protected branch (using --ff-only, i.e., fast forward).
6. Remove dummy branch (also remove it no matter if the workflow fails or succeeds).

So essentially in this way there will be no PR generated, which can be messed up unintentionally.
There will be no changing the protection on the protected branch.
However, it will be slow, and since it's a Docker-based Action, all changes need to done within the Action itself. This is sorted by having a bash script in the repo that can be referenced in the workflow yml-file, downloaded by the action and then run.

Other changes

• Remove yml option for the Upload codecov action (it is no longer available).
• Update to the latest release, v0.9.4
• Remove check_released_tag.py, since it is no longer needed.
• Add a docs extra to setup.py.
• Update dependencies in setup.py according to the various updated requirements files.

[codecov]

Codecov Report

Merging #377 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #377   +/-   ##
=======================================
  Coverage   90.27%   90.27%           
=======================================
  Files          54       54           
  Lines        2386     2386           
=======================================
  Hits         2154     2154           
  Misses        232      232           

Flag	Coverage Δ
#unittests	90.27% <ø> (ø)

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[shyamd]

Looks good to me. Let's try it.