Update astral-sh/setup-uv action to v7

.github/workflows/python-app.yml

@@ -12,7 +12,7 @@ jobs:
 
     services:
       database:
-        image: postgres:18-alpine
+        image: postgres:17-alpine
         env:
           # password for postgres user in the Docker container
           POSTGRES_PASSWORD: postgres
@@ -29,7 +29,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: Install uv
-      uses: astral-sh/setup-uv@v6
+      uses: astral-sh/setup-uv@v7
       with:
         version: 'latest'
     - run: uv sync