GHSA-VMXC-H2X2-JMF3 Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifiers

Summary When an application using Pydantic AI opts a URL into local network access — either a FileUrl with forcedownload='allow-local', or webfetchtoolallowlocalurls=True — the cloud-metadata blocklist could be bypassed by appending an IPv6 zone identifier to a metadata address for example...