Pin the uv version in GHA

Author: mmwinther

.github/workflows/generate-python.yml

@@ -38,6 +38,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
         with:
+          version: "0.7.2"
           enable-cache: true
 
       - name: Generate All-optional Python models