Upgrade aiolifx to 0.6.7

[amelchio]

Description:

This fixes an unhandled exception when no network interfaces are found (aiolifx/aiolifx#35) and thus allows us to use the default network interface in this situation.

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

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

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.