Bugfix to use evohome's new hostname

[zxdavb]

Please cherry-pick this PR for the next drop, thanks.

Proposed change

Bump client library to 0.4.21:

• see: zxdavb/evohome-async@0.4.20...0.4.21

The only difference is to change the hostname from tccna.honeywell.com to tccna.resideo.com. This is neccessary becaus ethe server's SSL cert no longer supports the old hostname.

(in future, we'll have to change the branding for evohome)

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)
• Deprecation (breaking change to happen in the future)
• 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
  EvoHome API URL Cert changed, needs update #133075 and its duplicate,
  Certificate verify failed: Hostname mismatch, certificate is not valid #133058
• 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
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format 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.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.

To help with the load of incoming pull requests:

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

[epenet]

LGTM 👍

[alexbakrasp]

Super👍