Update checkout action to version 5

Author: ctribes

.github/workflows/pypi.yml

@@ -37,7 +37,7 @@ jobs:
     runs-on: ${{ matrix.target.os }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-python@v5
         with:
           python-version: '3.14'