Update GHA CI action version of setup-python to latest.

Author: scoder

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Set up Python 3.8
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
         python-version: 3.8
 
@@ -90,7 +90,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Set up Python
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}