update setup-uv action to v8

Author: jcarbaugh

.github/workflows/pythonpackage.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: Install uv
-      uses: astral-sh/setup-uv@v6
+      uses: astral-sh/setup-uv@v8
     - name: Set up Python ${{ matrix.python-version }}
       run: uv python install ${{ matrix.python-version }}
     - name: Install dependencies