Bump actions/setup-python from 2 to 4 (pydata#126)

Author: dependabot[bot]

.github/workflows/pypipublish.yaml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
         name: Install Python
         with:
           python-version: 3.8
@@ -48,7 +48,7 @@ jobs:
     needs: build-artifacts
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
         name: Install Python
         with:
           python-version: '3.10'