Fix template weather humidity

[Petro31]

Breaking change

Proposed change

There's been a bug in weather #160537 for some time. Prior to the beta 2026.2.0bx, the entity was created regardless of the exception. After 2026.2.0bx, the entity is no longer created. This is likely due to the refactor in template weather.

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 # Template Weather entity fails to load in 2026.1.0: TypeError: type str doesn't define __round__ method on humidity #160537
• This PR is related to issue:
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