Update requirements.txt and requirements-ci.txt

[rmoyard]

Context

The idea is to:

• Pin strictly in the requirements.txt file;
• Have no version pins in the requirements-ci.txt file (exceptions apply);
• Pin strictly in the doc/requirements.txt file.

This way:

• Users will have a combination of dependency versions for which our package should work (requirements.txt file);
• On our CI, we see if a new version of a dependency breaks something (requirements-ci.txt file), but this doesn't affect users.

The same applies to the documentation requirements where the documentation build should continue to work even with new dependency versions being released.

Changes

Created an updated requirements.txt file by:

1. Creating a clean conda environment;
2. Installing the plugin with pip install -e .;

a) Saving the dependencies to a temporary req.txt file via pip freeze >> req.txt
b) Removing the PennyLane-Honeywell entry from req.txt;
4. Installing pytest and related packages and verifying that the test suite runs;
5. Making req.txt the new requirements.txt file.

• requirements-ci.txt: created by copying requirements.txt and removing the pinnings (except for semantic versioning which is pinned in PennyLane's setup.py file),
• doc/requirements.txt: created in a similar fashion to how requirements.txt created, just that make docs was being used for "installation".

[codecov]

Codecov Report

Merging #212 (90b731f) into master (f1d5ff7) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #212   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          292       292           
=========================================
  Hits           292       292           

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[antalszava]

[sc-17333]