Bump pwmled to v1.6.7

[soldag]

Proposed change

Fixes an issue when using rpi_gpio_pwm integration to control leds connected via GPIOs, which was introduced in previous version of the library.

soldag/python-pwmled@v1.6.6...v1.6.7

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 rpi_gpio_pwm error after upgrade to 0.117.* ('NoneType' object has no attribute 'send') #42873
• This PR is related to issue:
• 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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[frenck]

Thanks, @soldag 👍