curl: CVE-2024-6874: macidn punycode buffer overread

The libcurl at commit 58772b0e082eda333e0a5fc8fb0bc7f17a3cd99c contained a stack-buffer overread in the function macidntoascii that could be triggered when the host of a URL was converted to punycode. The root cause was in the function uidnanameToASCIIUTF8, which left the output buffer unterminat...