install-poetry.py: Use new official install location

This operates independently of poetry releases so it can pull
bugfixes merged outside of poetry's own release cadence.

See also:
- https://github.com/python-poetry/install.python-poetry.org
- python-poetry/poetry#3345 (comment)

In conjunction with asdf-community#14 this gets python 3.10 working with poetry
1.1.11 where ModuleNotFoundError: No module named 'cleo' was raised.

bin/install

@@ -34,7 +34,7 @@ install_poetry() {
  semver_ge "$ASDF_INSTALL_VERSION" 1.2.0 && vercomp="ge" || vercomp="lt"
 
  if [ $vercomp == "ge" ]; then
- install_url="https://raw.githubusercontent.com/python-poetry/poetry/master/install-poetry.py"
+ install_url="https://install.python-poetry.org/"
  curl -sSL "$install_url" | POETRY_HOME=$install_path python3 - --version "$version"
  else
  install_url="https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py"