Update pubPyPI.yml

setup-python from @v2 -> @v4
checkout from @v2 -> @V3

Author: DanielGoldfarb

.github/workflows/pubPyPI.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout Repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         ref:  ${{ github.event.inputs.tag }}
 
@@ -22,7 +22,7 @@ jobs:
       run: egrep 'version_info .*=' src/mplfinance/_version.py
 
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: '3.x'