Bump pyatv to 0.7.6

[postlund]

Proposed change

Upgrade pyatv to 0.7.6 with the following changes (extract from change log):

• DNS parsing has been re-written which should be more stable and handle more use cases
• TCP keep-alive has been added to more platforms, FreeBSD being one of them
• Player management has been totally re-written for MRP, so hopefully play state should be more accurate now
• A delay has been added to turn_off (MRP), so it should work again
• A heartbeat loop has been added that sends a "heartbeat" to the device every 30s to detect connection problems
• Protobuf definitions have been further lifted to match later tvOS version
• Fixed a bug where Playing instancess were not immutable
• Push updates are only issued when something in the Playing instance changed. Previously, unrelated changes to the device could trigger push updates with the same content in Playing.

https://github.com/postlund/pyatv/releases/tag/v0.7.6

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 Apple TV State Not Updating #44305, fixes [pyatv.support.mdns] exception during data handling #44471, fixes Apple TV exception during data handling #45429
• 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
• The code has been formatted using Black (black --fast 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.
• Untested files have been added to .coveragerc.

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To help with the load of incoming pull requests:

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

[MartinHjelmare]

Please add a link to a changelog or GitHub commit compare view for the version bump in the PR description. Thanks!

[MartinHjelmare]

I've added the link. 👍

[postlund]

You beat me to it! 🚴‍♂️

[MartinHjelmare]

Thanks!

[postlund]

If it's possible to wish, it would be great to have this included in the next release as it fixes a few issues people are having.

[MartinHjelmare]

And the other changes are safe, ie don't mean users need to change anything?

[postlund]

Nah, it's just bug fixes and robustness enhancements in this release.

[MartinHjelmare]

Ok, tagged. 👍

[bdraco]

Just tested and everything appears to be working as expected.

I did notice that the mdns processing (https://www.home-assistant.io/integrations/profiler/) is the most expensive operation on an idle instance:

[postlund]

@bdraco Great catch, can you open an issue in the pyatv project and include the image?