I just ran into this issue on Leap 15.4 and got here by Google search. It occurs when you install libcurl-devel which only exists in repo devel:libraries:c_c++. Zypper will suggest to also update curl and libcurl (option 1) and after you do so, curl is broken.
Just for your convenience, if your OS is Leap 15.4, the commands to fix the issue are:
wget https://download.opensuse.org/repositories/devel:/libraries:/c_c++/15.4/x86_64/libnghttp2-14-1.52.0-lp154.1.1.x86_64.rpm
sudo rpm --force -hiv libnghttp2-14-1.52.0-lp154.1.1.x86_64.rpm