use older uv setup for now

Author: lukaspie

.github/workflows/nomad-compatibility.yml

@@ -46,7 +46,7 @@ jobs:
         echo "" >> test_plugins.txt
         echo "pynxtools@git+https://github.com/FAIRmat-NFDI/pynxtools.git@${{ github.head_ref || github.ref_name }}" >> test_plugins.txt
     - name: Install uv and set the python version to ${{ env.python-version }}
-      uses: astral-sh/setup-uv@v6
+      uses: astral-sh/setup-uv@v5
       with:
         python-version: ${{ env.python-version }}
     - name: Generate (dev-)requirements.txt from modified pyproject.toml