Stop disabling new poetry installer

This was added in
#3459 to workaround
the underlying issue of
python-poetry/poetry#3010.

However, `poetry` `1.2` fixed the underlying issue, and we are now on `poetry` `1.2.1` so we can remove this workaround.

See also:
* python-poetry/poetry#3010 (comment)
* python-poetry/poetry#3010 (comment)
* python-poetry/poetry#3010 (comment)
* #5492

python/helpers/build

@@ -19,8 +19,3 @@ cp -r \
 
 cd "$install_dir"
 PYENV_VERSION=3.10.6 pyenv exec pip --disable-pip-version-check install --use-pep517 -r "requirements.txt"
-
-# Workaround of https://github.com/python-poetry/poetry/issues/3010
-# By default poetry config file is stored under ~/.config/pypoetry
-# and is not bound to any specific Python version
-PYENV_VERSION=3.10.6 pyenv exec poetry config experimental.new-installer false