docs: fix broken URL

[smarthome-10]

Description of change

This PR fixes a broken URL in the contributing.md file.

Pull-Request Checklist

• Code is up-to-date with the main branch
• This pull request follows the contributing guidelines.
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change
• The new commits follow conventions outlined in the conventional commit spec, such as "fix(api): prevent racing of requests".

• If pre-commit.ci is failing, try pre-commit run -a for further information.
• If CI / test is failing, try uv run pytest for further information.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d2d2c03) to head (6c816f1).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #26   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           14        14           
  Branches         1         1           
=========================================
  Hits            14        14           

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