CMake: Bump required libsolv version
CMake: Bump required libsolv version

This was supposed to be done in b534bb224f4db35b1f96507d81cc65bb6ae7a5fb,
but it was missed.

hughsie/libhif,rpm-software-management/libdnf,hughsie/libhif,Conan-Kudo/libhif,Conan-Kudo/libhif,hughsie/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,rpm-software-management/libdnf,rpm-software-management/libdnf,Conan-Kudo/libhif,rpm-software-management/libhif,hughsie/libhif,rpm-software-management/libhif,Conan-Kudo/libhif,rpm-software-management/libhif