Update github actions packages

Author: holtskinner

.github/workflows/run-tck.yaml

@@ -33,10 +33,10 @@ jobs:
         python-version: ['3.10', '3.13']
     steps:
       - name: Checkout a2a-python
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@v7
         with:
           enable-cache: true
           cache-dependency-glob: "uv.lock"
@@ -48,7 +48,7 @@ jobs:
         run: uv sync --all-extras
 
       - name: Checkout a2a-tck
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: a2aproject/a2a-tck
           path: tck/a2a-tck