Fix pipeline

Author: Lennart Vater

.github/workflows/main.yml

@@ -58,7 +58,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Install the project
-      run: uv sync${{ matrix.extra-string && " " + matrix.extra-string }} --dev
+      run: uv sync${{ matrix.extra-string && ' ' + matrix.extra-string }} --dev
 
     - name: Run tests with coverage
       run: |
@@ -68,7 +68,7 @@ jobs:
 
     - name: Upload coverage files
       uses: actions/upload-artifact@v4
-      if: ${{ matrix.python-version == "3.8" && matrix.extra-string == "--all-extras" }}
+      if: ${{ matrix.python-version == '3.8' && matrix.extra-string == '--all-extras' }}
       with:
         name: coverage-files
         path: |