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Description of problem:
The package has been removed and it is documented:
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/considerations_in_adopting_rhel_8/index#removed-packages_changes-to-packages

Why this package isn't delivered, whereas it is present in the spec file?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
%package devel
Summary: Lasso development headers and documentation
Group: Development/Libraries
Requires: %{name}%{?_isa} = %{version}-%{release}

%description devel
This package contains the header files, static libraries and development
documentation for Lasso.

%files devel
%{_libdir}/liblasso.so
%{_libdir}/pkgconfig/lasso.pc
%{_includedir}/%{name}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Version-Release number of selected component (if applicable):
Name         : lasso
Version      : 2.6.0
Release      : 8.el8
Architecture : x86_64
Size         : 207 k
Source       : lasso-2.6.0-8.el8.src.rpm
Repository   : AppStream

Short update: I requested that the package is included at least in CentOS.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: lasso security and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:4325