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

Author: renovate[bot]

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
       id-token: write
     steps:
       - uses: actions/checkout@v6.0.1
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.12'
       - uses: snok/install-poetry@v1.4.1

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v6.0.1
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies