chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/cicd.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
 
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1

.github/workflows/pr.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
 
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
     timeout-minutes: 10
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1