Pending RELEASE-NOTES for the upcoming release

This is work in progress and will change before the release goes public on 6th of July 2022.

Changes:

• curl: deprecate --random-file and --egd-file
• opts: deprecate RANDOM_FILE and EGDSOCKET
• socks: support unix sockets for socks proxy

Bugfixes:

• aws-sigv4: fix potentional NULL pointer arithmetic
• bindlocal: don't use a random port if port number would wrap
• ci: update github actions
• cmake: add libpsl support
• cookie: address secure domain overlay
• curl.1: mention exit code zero too
• Curl_parsenetrc: don't access local pwbuf outside of scope
• docs: clarify data replacement policy for MIME API
• FAQ: Clarify Windows double quote usage
• gssapi: improve handling of errors from gss_display_status
• gssapi: initialize gss_buffer_desc strings
• http2: always debug print stream id in decimal with %u
• macos9: remove partial support
• Makefile.am: fix portability issues
• mprintf: ignore clang non-literal format string
• ngtcp2: Correct use of ngtcp2 and nghttp3 signed integer types
• ngtcp2: extend QUIC transport parameters buffer
• ngtcp2: Fix alert_read_func return value
• ngtcp2: handle error from ngtcp2_conn_submit_crypto_data
• ngtcp2: send appropriate connection close error code
• ngtcp2: support boringssl crypto backend
• quic: add Curl_quic_idle
• quiche: support ca-fallback
• sectransp: check for a function defined when __BLOCKS__ is undefined
• strcase: some optimisations
• tests 266, 116 and 1540: add a small write delay
• tests/server/sws.c: change the HTTP writedelay unit to milliseconds
• tool_operate: make sure --fail-with-body works with --retry
• transfer: Fix potential NULL pointer dereference
• url: free old conn better on reuse
• url: remove redundant #ifdefs in allocate_conn()
• wolfssh.h: removed
• wolfSSL: explicitly use compatibility layer
• x509asn1: mark msnprintf return as unchecked

Contributors:

Andrea Pappacoda, Balakrishnan Balasubramanian, Christian Weisgerber via curl-library, Daniel Gustafsson, Daniel Stenberg, Egor Pugin, Fabian Keil, Frank Gevaerts, Frazer Smith, Gregor Jasny, Harry Sintonen, Illarion Taev, Jakub Bochenski, Kamil Dudka, KotlinIsland on github, Nick Zitzmann, Ray Satiro, Tatsuhiro Tsujikawa, Vincent Torri, vvb2060 on github, Elms