Use time.monotonic instead of time.time where appropriate

[scop]

Proposed change

See time() vs monotonic() docs.

For netatmo, self._next_update appears to be unused, so removed.

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

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• This PR fixes or closes issue: fixes #
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[probot-home-assistant]

Hey there @cgtobi, mind taking a look at this pull request as its been labeled with a integration (netatmo) you are listed as a codeowner for? Thanks!

[probot-home-assistant]

Hey there @k4ds3, mind taking a look at this pull request as its been labeled with a integration (proxmoxve) you are listed as a codeowner for? Thanks!