Remove bound on qiskit-aer version (backport #1306) (#1307)

This is an automatic backport of pull request #1306 done by
[Mergify](https://mergify.com).
Cherry-pick of 39a0d87 has failed:
```
On branch mergify/bp/stable/0.5/pr-1306
Your branch is up to date with 'origin/stable/0.5'.

You are currently cherry-picking commit 39a0d87.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   requirements-extras.txt

no changes added to commit (use "git add" and/or "git commit -a")
```


To fix up this pull request, you can check it out locally. See
documentation:
https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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Co-authored-by: Will Shanks <[email protected]>
Co-authored-by: Helena Zhang <[email protected]>

requirements-dev.txt

@@ -13,7 +13,7 @@ reno>=4.0.0
 nbsphinx
 arxiv
 ddt>=1.6.0
-qiskit-aer>=0.11.0,<=0.12.2 # Temporary version pin because of https://github.com/Qiskit-Extensions/qiskit-experiments/issues/1292
+qiskit-aer>=0.11.0
 pandas>=1.1.5
 cvxpy>=1.1.15
 pylatexenc