Readthedocs build fix

Author: p1c2u

.github/workflows/docs-build.yml

@@ -23,6 +23,8 @@ jobs:
 
       - name: Set up poetry
         uses: Gr1N/setup-poetry@v9
+        with:
+          poetry-version: "2.1.1"
 
       - name: Configure poetry
         run: poetry config virtualenvs.in-project true