ci: update actions/checkout@v4

.github/workflows/dotnet.yml

@@ -10,7 +10,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - name: Checkout
+      uses: actions/checkout@v4
+
     - name: Setup .NET
       uses: actions/setup-dotnet@v3
       with:

.github/workflows/prerelease.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup .NET
       uses: actions/setup-dotnet@v3

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup .NET
       uses: actions/setup-dotnet@v3