f143af github-workflow: remove pydantic pinned version

1 file Authored by Carlos Rodriguez-Fernandez a year ago, Committed by Adam Saleh a year ago,
    github-workflow: remove pydantic pinned version
    
    It is no longer necessary. Since it is fixed, it is better
    for duffy to manage the dependency itself.
    
    See github.com/CentOS/duffy/pull/865
    
    Signed-off-by: Carlos Rodriguez-Fernandez <carlosrodrifernandez@gmail.com>