Hello Maha,
cta-fst-gcd has been removed from CTA repository: see Move `cta-fst-gcd` from cta to ctaops repository (#1118) · Issues · cta / CTA · GitLab
It is now in ctaops repository as a standalone rpm: I am just not sure how you can get it.
In the meantime you can use the last stable available version of this rpm on your EOS FSTs: cta-fst-gcd-5.11.2.0-1.el9.x86_64.rpm
Sorry for the inconvenience.
Best regards,
Julien Leduc