CI: github: switch monthly Fedora Rawhide build to OpenSSL
QuicTLS builds are already run on push and openssl+quictls patchset is
not maintained anymore. The patch switch from openssl+quictls to the
native openssl of fedora.
Fedora Rawhide builds are mainly useful to test the latest gcc and clang
versions as well as default options of the distribution.
The patch also contains a workaround to re-enable legacy algorithms
which are still tested on the CI.