build: bump virtualenv from 20.26.2 to 20.26.6 #132

Job	Run time
docker-build (rag-adminwebapp, docker/Admin.Dockerfile) / docker-build	39s
docker-build (rag-webapp, docker/Frontend.Dockerfile) / docker-build	43s
docker-build (rag-backend, docker/Backend.Dockerfile) / docker-build	40s
	2m 2s

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