guzzlehttp/guzzle 7.12.0 on PHP Packagist

Adjusted guzzlehttp/psr7 version constraint to ^2.12
Constrain cURL transport sharing to safe libcurl DNS and SSL session support
Resolve proxy environment variables in the cURL handlers; libcurl no longer reads the environment itself
Ignore proxy environment variables when the proxy request option makes a decision
Disable proxy environment variables on Windows SAPIs other than CLI (httpoxy hardening)
Redact proxy credentials from cURL handler error messages, following Psr7\Utils::redactUserInfo()
Normalize no-proxy domain and IP literal matching across the cURL and stream handlers

Deprecated the request-level handler option, which will be ignored in 8.0
Deprecated raw cURL request options outside the built-in cURL handlers' allow-list
Deprecated the CURLOPT_PROXYTYPE cURL request option; set the proxy type via a scheme-prefixed proxy URL
Deprecated PHP stream context options outside the built-in stream handler allow-list
Deprecated passing ntlm as a built-in auth type
Deprecated Utils::describeType()
Deprecated non-finite floats in the query and form_params options; 8.0 rejects them
Deprecated non-string scalar values in the body option; 8.0 rejects them

Fix cURL TLS and HTTP/2 capability detection using libcurl feature checks
Fix proxy no list matches being re-proxied through environment-configured proxies by libcurl
Fix no list and NO_PROXY matching to support IP CIDR ranges, matching libcurl
Fix the stream handler not applying scheme-less proxies and their credentials