Update GitHub Actions to use newer versions (#71)

.github/workflows/test.yml

@@ -29,12 +29,12 @@ jobs:
       fail-fast: false
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Install uv
-      uses: astral-sh/setup-uv@v5
+      uses: astral-sh/setup-uv@v7
       with:
-        version: "0.5.15"
+        version: "0.9.28"
 
     - name: Set up Python
       shell: bash