fix: pin poetry version on CI main

Author: davidteather

.github/workflows/ci-main.yml

@@ -21,7 +21,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Install Poetry
-        run: curl -sSL https://install.python-poetry.org | python3 -
+        run: curl -sSL https://install.python-poetry.org | POETRY_VERSION=1.8.3 python3 -
 
       - name: Configure Poetry to create virtualenvs in project root
         run: poetry config virtualenvs.in-project true