Ashark [1] filed a deletion request for cogl-amdgpu-pro [2]:
I do not know what cogl is, but since 2016 (when this package was
submitted), nobody asked to renew it. And it contained a dependency
"amdgpu-pro" which is not provided by amdgpu-pro-installer for a very
long time.
So I think this cogl-amdgpu-pro should just be removed.
[1] https://aur.archlinux.org/account/Ashark/
[2] https://aur.archlinux.org/pkgbase/cogl-amdgpu-pro/