Proposed change

This PR restores the httpx behavior for boolean query parameters in the REST integration after the migration from httpx to aiohttp.

When the REST integration was migrated from httpx to aiohttp, we lost httpx's automatic conversion of boolean values to lowercase strings in query parameters. This broke existing user configurations that relied on this behavior.

For example, this configuration that worked with httpx:

rest:
  - resource: https://api.example.com/data
    params:
      inclBtw: true  # Boolean value

Now fails with:

TypeError: Invalid variable type: value should be str, int or float, got True of type <class 'bool'>

This PR adds a compatibility layer that converts boolean values to lowercase strings (True → "true", False → "false") before passing them to aiohttp, matching httpx's behavior and restoring backward compatibility.

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 2025.7.0b3 breaks restful sensor. #147708 fixes 2025.7.0bX Error while setting up rest platform for sensor: Invalid variable type: value should be str, int or float, got True of type <class 'bool'> #147752
• This PR is related to issue:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend 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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