chore(deps): update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
       group: ${{ github.workflow }}-${{ github.ref }}
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.14"
       - run: python3 -m pip install --upgrade pip

.github/workflows/deploy.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Setup Python environment
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: "3.14"