ngtcp2 depends on crypto backends. nghttp2 depends on ngtcp2 and nghttp3
(for nghttpx server used in pytests).
Before this patch, ngtcp2, nghttp2 weren't rebuilt when their
dependencies changes. This worked fine until wolfSSL bumped its
soversion and caused CI to fail because ngtcp2 was not rebuilt and was
still referring to the old soname that was no longer offered by the
wolfSSL package.
Make sure to rebuild ngtcp2/nghttp2 when any of their dependencies bump.
To avoid rebuilding everything on every wolfSSL commit, switch to use
wolfSSL stable versions.
Bug: https://github.com/curl/curl/pull/15882#issuecomment-2566821417Closes#15885
852692b24f