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

Author: renovate[bot]

.github/workflows/lint.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.6'
       - name: Install Flake8

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Install Python 3
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v6
         with:
           python-version: 3.11
       - name: Install dependencies