Fix domain ownership check (checksum format to lowercase)

[aliel]

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[github-actions]

The diff highlights a subtle change in the comparison logic for entry.text to ensure case-insensitive matching. This modification could potentially affect the behavior of the check_domain function, especially if the DNS record values are case-sensitive in other parts of the codebase. The original comparison used a direct comparison (entry.text == record_value), which might not account for differences in case. The updated comparison uses str(entry.text).lower() == str(record_value).lower(), ensuring that the comparison is case-insensitive.

This change could introduce subtle bugs if the function relies on the case of the text records. It is crucial to review this change to ensure it does not break the expected behavior of the function in other parts of the application. The potential impact is high due to the potential for introducing bugs and the need for a deep understanding of the DNS record handling logic. Therefore, a thorough review is recommended to avoid any unintended consequences.