Pin charset-normalizer to 2.0.12

[ludeeus]

Breaking change

Proposed change

charset-normalizer was released with version 2.1.0 9 days ago.
This version causes a conflict.

• aiohttp==3.8.1 [requires: charset-normalizer>=2.0,<3.0]
• requests==2.28.0 [requires: charset-normalizer~=2.0.0]

There is a PR open to loosening the requirements of requests, but until that lands in a new version of it, we should limit this to 2.0.12.
psf/requests#6169

Type of change

• Dependency upgrade
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Additional information

• This PR fixes or closes issue: fixes Dev container fails to setup due to charset-normalizer dependency #74069
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[frenck]

Rebased the PR, not sure why, but the CI didn't trigger fully after the last commit 🤷