Update abatilo/actions-poetry action to v4 (#67)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/publish.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Update pip
       run: python -m pip install -U pip
     - name: Set up Poetry
-      uses: abatilo/actions-poetry@v3
+      uses: abatilo/actions-poetry@v4
     - name: Install dependencies
       run: poetry install
     - name: Build

.github/workflows/tests.yml

@@ -34,7 +34,7 @@ jobs:
     - name: Update pip
       run: python -m pip install -U pip
     - name: Set up Poetry
-      uses: abatilo/actions-poetry@v3
+      uses: abatilo/actions-poetry@v4
     - name: Install dependencies
       run: poetry install
     - name: Run tests