(PA-5792) Update Checkout GitHub Action

The Checkout GitHub Action v3 uses Node 16, which hit end-of-life on
September 11, 2023.

This commit updates all instances of the Checkout Action from v3 to
v4.

Author: mhashizume

.github/workflows/static_code_analysis.yaml

@@ -17,7 +17,7 @@ jobs:
     runs-on: 'ubuntu-20.04'
     steps:
       - name: Checkout current PR code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 

.github/workflows/task_acceptance_tests.yaml

@@ -23,7 +23,7 @@ jobs:
     runs-on: 'ubuntu-20.04'
     steps:
       - name: Checkout current PR code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install docker
         uses: docker/setup-buildx-action@v1