Pin yarl dependency to 1.4.2 as core dependency

[frenck]

Proposed change

This PR pins the yarl version as a core dependency, to 1.4.2.

Recently, 1.5.0 was introduced, which fixed this bug:

aio-libs/yarl#426

This effects how URLs parts are encoded and caused our google_translate integration to break (as strings are now double encoded). I'm opening a separate PR to fix that TTS integration.

Reason for not pinning 1.5.0: It looks like that version is a candidate for being pulled, see:

aio-libs/yarl#485

Type of change

• Dependency upgrade pinning
• 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

Example entry for configuration.yaml:

# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: Google Translate TTS pronounce urlencoded characters #38339
• 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.
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• 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

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• 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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