readme: Remove outdated vulnerability information

[brian6932]

curl on Windows was updated very shortly after the severe vulnerability in 8.3.0, this information's almost a year out of date, and would only apply to out of support Windows versions (<= 8.1).

❯ where curl
C:\ProgramData\scoop\shims\curl.exe
c:\Windows\System32\curl.exe

❯ C:\ProgramData\scoop\shims\curl.exe --version
curl 8.10.1 (x86_64-w64-mingw32) libcurl/8.10.1 LibreSSL/3.9.2 zlib/1.3.1 brotli/1.1.0 zstd/1.5.6 WinIDN libpsl/0.21.5 libssh2/1.11.0 nghttp2/1.63.0 ngtcp2/1.7.0 nghttp3/1.5.0
Release-Date: 2024-09-18
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss
Features: alt-svc AsynchDNS brotli CAcert HSTS HTTP2 HTTP3 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI threadsafe UnixSockets zstd

❯ c:\Windows\System32\curl.exe --version
curl 8.7.1 (Windows) libcurl/8.7.1 Schannel zlib/1.3 WinIDN
Release-Date: 2024-03-27
Protocols: dict file ftp ftps http https imap imaps ipfs ipns mqtt pop3 pop3s smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS HSTS HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM SPNEGO SSL SSPI threadsafe Unicode UnixSockets

[cvzi]

Thank you!