Update pvo to 0.2.1

[frenck]

Proposed change

Updates pvo to 0.2.1

Release notes: https://github.com/frenck/python-pvoutput/releases/tag/v0.2.1

Fixes #65510

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)
• 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 PVOutput migration appears to have failed #65510
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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[probot-home-assistant]

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