Revert to using checkout Action v2 in the publishing CI

Author: IshaanDesai

.github/workflows/pythonpublish.yml

@@ -9,9 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-      with:
-        fetch-depth: 0
+    - uses: actions/checkout@v2
     - name: Set up Python
       uses: actions/setup-python@v5
       with: