[v0.43.0 Release] Pin autoray version to 0.8.0

[andrijapau]

autoray has proven to deliver breaking changes even in their bug fixes. To prevent future pennylane bug fix releases we have decided to pin the release's supported version of autoray to 0.8.0.

It was confirmed that reverse dependencies of autoray like cotengra and quimb don't clash with this constraint.

[sc-100894]

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit doc/releases/changelog-dev.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[mlxd]

Just a note, the pyproject.toml file changes are the only ones that are required. This will propagate outwards for the rest

Approved, but feel free to modify the rest if you think it is best

[andrijapau]

Sorry @mlxd , didn't see you approved. What do you think of this change: 95862a5? Seems weird to have all of this git history in the release notes.

CC @isaacdevlugt for product review.

[andrijapau]

Just a note, the pyproject.toml file changes are the only ones that are required. This will propagate outwards for the rest

Approved, but feel free to modify the rest if you think it is best

I think the installation.rst changes are necessary so that the stable website will reflect the true requirements of the autoray package for v0.43.0. 👍🏼

As per the requirements files ... I don't know. I figured might as well update them. 😅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v0.43.0-rc0@a608f90). Learn more about missing BASE report.

Additional details and impacted files

@@              Coverage Diff               @@
##             v0.43.0-rc0    #8412   +/-   ##
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  Coverage               ?   99.42%           
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  Files                  ?      584           
  Lines                  ?    61234           
  Branches               ?        0           
==============================================
  Hits                   ?    60883           
  Misses                 ?      351           
  Partials               ?        0           

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Need to make changes to requirements.txt files.

[andrijapau]

@mlxd here's the change: 21a3e33. Manually reverted unnecessary changes. Leaving only the changes to pyproject.toml and the installation guide (to reflect true constraints).