Bumps versions python-publish action.

This action has been failing due to old versions:
https://github.com/google/CommonLoopUtils/actions/runs/4796944293

Updating versions as proposed in:
https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python#publishing-to-package-registries

PiperOrigin-RevId: 526955259

Author: andsteing

.github/workflows/python-publish.yml

@@ -13,9 +13,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: '3.x'
     - name: Install dependencies