Bump pymodbus v3.6.7

[janiversen]

Breaking change

Proposed change

Update pymodbus to solve (hopefully) the problem introduced in 2024.4.0.

release log: https://github.com/pymodbus-dev/pymodbus/releases/tag/v3.6.7

change log: https://github.com/pymodbus-dev/pymodbus/blob/master/CHANGELOG.rst

Please be aware that there are no guarantees, that all problems are gone. If you experience problems, then
please open an issue, but please remember the following:

• include a copy of the modbus configuration (preferable reduced to make it easier to analyze)
• include a debug log as pr modbus integration documentation

If you have multiple modbus devices configured, then please try to run with one device at a time, and only report the failing device (a log with multiple devices are very complicated to analyze).

If you use custom_components, then please disable those before logging ! if you use a custom_component that internally use modbus, then please report any issues to the custom_component developers.

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 #
  fixes modbus 2024.4.x problem tracker. #115236

• This PR is related to issue:

• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
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• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[janiversen]

The failing test is in zwave_js and have nothing to do with this library bump.