Fix: Update to newer Poetry installer for tests.

Author: bjones1

.github/workflows/python-package.yml

@@ -36,13 +36,12 @@ jobs:
                   python-version: ${{ matrix.python-version }}
             - name: Install dependencies
               run: |
-                  python -m pip install --upgrade pip
-                  # Install Poetry per the `instructions <https://python-poetry.org/docs/#osx--linux--bashonwindows-install-instructions>`.
-                  curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python -
-                  $HOME/.poetry/bin/poetry install
+                  # Install Poetry per the `instructions <https://python-poetry.org/docs/master/#installing-with-the-official-installer>`.
+                  curl -sSL https://install.python-poetry.org | python3 -
+                  $HOME/.local/bin/poetry install
             - name: Tests
               run: |
-                $HOME/.poetry/bin/poetry run pytest
+                $HOME/.local/bin/poetry run pytest
 
             - uses: act10ns/slack@v1
               with: