Update actions/setup-python action to v5 (#22)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/python-publish.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: "3.x"
       - name: Install dependencies

.github/workflows/update_shfmt_checksums.yml

@@ -25,7 +25,7 @@ jobs:
         run: echo "commit_message=$(git log -1 --pretty=%B)" >> $GITHUB_ENV
 
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: '3.x'