Mention case-sensitivity in tplink credentials prompt

[rytilahti]

Proposed change

There are several reports about an error "Server response doesn't match our challenge" coming from the upstream library, which simply points out that the credentials do not match.
It has been reported that this might be due to incorrect letter casing in the e-mail address, e.g., #133164 (comment) and python-kasa/python-kasa#1351 (comment) .

To make it clear that both email and password should be written as they were when the device was provisioned through the app, this PR adds a remark about the case-sensitivity of the credentials to the input dialogs.

Related upstream PRs documenting the behavior:

• Document hashing of credentials python-kasa/python-kasa#1416
• Improve exception messages on credential mismatches python-kasa/python-kasa#1417

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: Adding Tapo P115 fails with Server response doesn't match our challenge #133164
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[home-assistant]

Hey there @bdraco, @sdb9696, mind taking a look at this pull request as it has been labeled with an integration (tplink) you are listed as a code owner for? Thanks!

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[frenck]

Thanks, @rytilahti 👍

Happy New Year 🥂

../Frenck