Handle exceptions when parsing 'retry-after' header in rate limit handling

[ludeeus]

This pull request introduces a minor improvement to the rate-limit handling logic in the async_download_file method. The change ensures that the value of the retry-after header is safely parsed, preventing potential errors if the header is missing or not an integer.

• Improved robustness when handling the retry-after header by adding a try...except block to catch parsing errors, defaulting to 10 seconds if necessary in custom_components/hacs/base.py.