Merge pull request #140 from nextstrain/dependabot/github_actions/actions/setup-python-6

Author: dependabot[bot]

.github/workflows/sync-rtd-redirects.yaml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
 
       - name: Upgrade Python toolchain
         run: python3 -m pip install --upgrade pip setuptools wheel