Upgrade py-cpuinfo to 0.2.7

[fabaff]

0.2.7

• https://github.com/workhorsy/py-cpuinfo/commits/master

Tested with the following configuration:

sensor:
  - platform: cpuspeed
    name: CPU

[mention-bot]

@fabaff, thanks for your PR! By analyzing the history of the files in this pull request, we identified @balloob, @rmkraus and @robbiet480 to be potential reviewers.