Update setup-python GitHub Actions.md

We need to update the following action because not doing so will result on an error on certain architectures, see error below.

`Run actions/setup-python@v1
  with:
    python-version: 3.8
    architecture: x64
Error: Version 3.8 with arch x64 not found
Available versions: `

Version 4 of this action fixed the issue for me

docs/4.Integrations/GitHub Actions.md

@@ -36,7 +36,7 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up Python 3.8
         uses: actions/setup-python@v1
         with: