Update poetry+virtualenv reproducer to 20.29.1

Author: sirosen

poetry-and-virtualenv/Dockerfile

@@ -1,11 +1,10 @@
 FROM python:3.10-slim-bookworm AS setup
-RUN apt-get update -y && apt-get install git -y
 
 WORKDIR /myapp/
 RUN \
     python -m venv --upgrade-deps .venv \
     && .venv/bin/python -m pip install 'poetry==2.0.1' \
-    && .venv/bin/python -m pip install 'git+https://github.com/robsdedude/virtualenv.git@fix/py-info-cache-versioning'
+    && .venv/bin/python -m pip install 'virtualenv==20.29.1'
 
 COPY pyproject.toml poetry.lock poetry.toml ./
 COPY src src