Generating SCAP report on Red Hat Enterprise Linux 9 fails with cannot load such file json LoadError error.

Issue

SCAP Report generation on Red Hat Enterprise Linus 9 fails with following error.

# /usr/bin/foreman_scap_client 1
<internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:85:in `require': cannot load such file -- json (LoadError)
    from <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:85:in `require'
    from /usr/share/gems/gems/foreman_scap_client-0.5.0/lib/foreman_scap_client/base_client.rb:9:in `<top (required)>'
    from <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:85:in `require'
    from <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:85:in `require'
    from /usr/share/gems/gems/foreman_scap_client-0.5.0/lib/foreman_scap_client/client.rb:1:in `<top (required)>'
    from <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:85:in `require'
    from <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:85:in `require'
    from /usr/share/gems/gems/foreman_scap_client-0.5.0/lib/foreman_scap_client.rb:2:in `<top (required)>'
    from <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:85:in `require'
    from <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:85:in `require'
    from /usr/share/gems/gems/foreman_scap_client-0.5.0/bin/foreman_scap_client:3:in `<top (required)>'
    from /usr/bin/foreman_scap_client:23:in `load'
    from /usr/bin/foreman_scap_client:23:in `<main>'