ci: python3-minimal is insufficient

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 # NDN Traffic Generator
 
-[![CI](https://github.com/named-data/ndn-traffic-generator/actions/workflows/ci.yml/badge.svg)](https://github.com/named-data/ndn-traffic-generator/actions/workflows/ci.yml)
 ![Language](https://img.shields.io/badge/C%2B%2B-17-blue)
+[![CI](https://github.com/named-data/ndn-traffic-generator/actions/workflows/ci.yml/badge.svg)](https://github.com/named-data/ndn-traffic-generator/actions/workflows/ci.yml)
 
 This tool is designed to generate Interest and Data traffic in an NDN network.
 The client and server tool accept traffic configuration files which can be