I had the same issue. I believe its because centos7 uses python2 by default and GVM has python3 as a dependency.
This is how I fixed it
yum install -y python3
yum --enablerepo=extras install epel-release
yum install python-devel
yum install libffi-devel
yum install openssl-devel
yum install python-pip
pip install paramiko
pip install --upgrade pip
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