Add poetry lock to CI

Author: kks32

.github/workflows/build-test.yml

@@ -19,6 +19,8 @@ jobs:
         uses: abatilo/actions-poetry@v2
         with:
           poetry-version: ${{ matrix.poetry-version }}
+      - name: Update lock file
+        run: poetry lock --no-update
       - name: Install the project dependencies
         run: poetry install
       - name: Lint with black