Pending RELEASE-NOTES for the upcoming release

This is work in progress and will change before the release goes public on 2023-05-17.

Changes:

Bugfixes:

• CI: fix brew retries on GHA
• CI: skip Azure for commits which change only GHA
• cmake: bring in the network library on Haiku
• cmake: set SONAME for SunOS too
• data.d: emphasize no conversion
• digest: clear target buffer
• GHA-linux: add an address-sanitizer build
• GHA: add a memory-sanitizer job
• GHA: run all linux test jobs with valgrind
• gskit: various compile errors in OS400
• multi: add handle asserts in DEBUG builds
• ngtcp2: adjust config and code checks for ngtcp2 without nghttp3
• ntlm: clear lm and nt response buffers before use
• runtests: die if curl version can be found
• server/getpart: clear target buffer before load
• tool_operate: pass a long as CURLOPT_HEADEROPT argument

Contributors:

Brian Lund, Dan Fandrich, Daniel Stenberg, Douglas R. Reno, Jon Rumsey, Paul Howarth, Stefan Eissing