chore(dependencies): update snok/install-poetry action to v1.2.0

Author: renovate-bot

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
         with:
           python-version: "3.9"
           architecture: "x64"
-      - uses: snok/install-poetry@v1.1.8
+      - uses: snok/install-poetry@v1.2.0
       - run: poetry install
       - run: poetry run black --check .
       - run: poetry run isort . --check --diff
@@ -29,7 +29,7 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: snok/install-poetry@v1.1.8
+      - uses: snok/install-poetry@v1.2.0
       - run: poetry install
       - name: Test with tox
         run: poetry run tox