protobuf requires Python '>=3.7' but the running Python is 3.6.9

[erichelgeson]

The current vagrant install seems broken - from 02f89a7

    default: ==== Installing python modules ====
    default: Collecting tornado>=6.1 (from -r /vagrant/publite2/requirements.txt (line 1))
    default:   Downloading https://files.pythonhosted.org/packages/01/d1/8750ad20cbcefb499bb8b405e243f83c2c89f78d139e6f8c8d800640f554/tornado-6.1-cp36-cp36m-manylinux1_x86_64.whl (427kB)
    default: Collecting psutil>=5.6.1,~=5.6 (from -r /vagrant/publite2/requirements.txt (line 2))
    default:   Downloading https://files.pythonhosted.org/packages/d6/de/0999ea2562b96d7165812606b18f7169307b60cd378bc29cf3673322c7e9/psutil-5.9.1.tar.gz (479kB)
    default: Collecting mysql-connector-python>=8.0.12,~=8.0 (from -r /vagrant/freeciv-proxy/requirements.txt (line 2))
    default:   Downloading https://files.pythonhosted.org/packages/32/cd/1581bfe8f5ad7fd2aecdc499f0387227ad7912419384f9393b6205a764da/mysql_connector_python-8.0.29-py2.py3-none-any.whl (342kB)
    default: Collecting Pillow (from -r /vagrant/scripts/freeciv-img-extract/requirements.txt (line 1))
    default:   Downloading https://files.pythonhosted.org/packages/7d/2a/2fc11b54e2742db06297f7fa7f420a0e3069fdcf0e4b57dfec33f0b08622/Pillow-8.4.0.tar.gz (49.4MB)
    default: Collecting wikipedia (from -r /vagrant/scripts/requirements.txt (line 2))
    default:   Downloading https://files.pythonhosted.org/packages/67/35/25e68fbc99e672127cc6fbb14b8ec1ba3dfef035bf1e4c90f78f24a80b7d/wikipedia-1.4.0.tar.gz
    default: Collecting requests3 (from -r /vagrant/scripts/requirements.txt (line 3))
    default:   Downloading https://files.pythonhosted.org/packages/26/80/043b00f8009001f43ee77a6d8aa17d13d09b3df32b8bbc8936b04e157e68/requests3-0.0.0-py2.py3-none-any.whl
    default: Collecting protobuf>=3.0.0 (from mysql-connector-python>=8.0.12,~=8.0->-r /vagrant/freeciv-proxy/requirements.txt (line 2))
    default:   Downloading https://files.pythonhosted.org/packages/6c/be/4e32d02bf08b8f76bf6e59f2a531690c1e4264530404501f3489ca975d9a/protobuf-4.21.0-py2.py3-none-any.whl (164kB)
    default: protobuf requires Python '>=3.7' but the running Python is 3.6.9
The SSH command responded with a non-zero exit status. Vagrant
assumes that this means the command failed. The output for this command
should be in the log above. Please read the output to determine what
went wrong.