user runner.os instead

Author: svlandeg

.github/workflows/test.yml

@@ -73,7 +73,7 @@ jobs:
       - name: Store coverage files
         uses: actions/upload-artifact@v4
         with:
-          name: coverage-${{ matrix.os }}-${{ matrix.python-version }}-${{ matrix.pydantic-version }}
+          name: coverage-${{ runner.os }}-${{ matrix.python-version }}-${{ matrix.pydantic-version }}
           path: coverage
           include-hidden-files: true