Modernize Python support and CI for Python 3.14

.github/workflows/build.yaml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         python-version: ${{ fromJSON(vars.ARCALOT_PYTHON_SUPPORTED_VERSIONS) }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Check out code
         uses: actions/checkout@v4
@@ -29,10 +29,9 @@ jobs:
           isort --profile black .
           black --line-length 79 .
           flake8 .
-      - name: Install Python Poetry
-        uses: snok/install-poetry@v1.4.1
-        with:
-          version: 1.8.3
+      - name: Install Poetry
+        run: |
+          python -m pip install poetry==${{ vars.ARCALOT_POETRY_VERSION }}
       - name: Install project dependencies
         run: poetry install --no-interaction
       - name: Run tests with coverage
@@ -57,14 +56,14 @@ jobs:
         if: ${{ matrix.python-version == vars.ARCALOT_PYTHON_VERSION }}
         uses: actions/upload-artifact@v4
         with:
-          name: dist
+          name: dist-${{ matrix.python-version }}
           path: dist
           if-no-files-found: error
       - name: Upload coverage HTML artifact
         if: ${{ matrix.python-version == vars.ARCALOT_PYTHON_VERSION }}
         uses: actions/upload-artifact@v4
         with:
-          name: coverage
+          name: coverage-${{ matrix.python-version }}
           path: htmlcov
           if-no-files-found: error
       - name: Upload Sphinx documentation
@@ -86,7 +85,7 @@ jobs:
       - name: Download artifacts
         uses: actions/download-artifact@v4
         with:
-          name: dist
+          name: dist-${{ vars.ARCALOT_PYTHON_VERSION }}
           path: dist
       - name: Install twine
         run: pip install -U twine