Revert GitHub actions version

Revert GitHub actions to previous version to troubleshoot job error.

Author: GreyNewfie

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
                 python-version: [ 3.7, 3.8, 3.9]
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v2
             - name: Set up Python ${{ matrix.python-version }}
               uses: actions/setup-python@v2
               with:
@@ -53,7 +53,7 @@ jobs:
         needs: ci
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v2
             - name: Set up Python 3.9
               uses: actions/setup-python@v2
               with:

.github/workflows/pullRequest.yml

@@ -17,7 +17,7 @@ jobs:
                 python-version: [ 3.7, 3.8, 3.9]
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v2
             - name: Set up Python ${{ matrix.python-version }}
               uses: actions/setup-python@v2
               with: