ci(netcore.yml): set version v3 to actions/checkout

.github/workflows/netcore.yml

@@ -1,36 +1,34 @@
 name: CI Build
-
-on:
+"on":
   pull_request:
     branches:
-      - "main"
+      - main
   push:
     branches:
-      - "main"
-
+      - main
 jobs:
   build:
-
     strategy:
       matrix:
-        platform: [ubuntu-latest, macos-latest, windows-latest]
-
+        platform:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
     runs-on: ${{ matrix.platform }}
-
     steps:
-    - uses: actions/checkout@v1
-    - name: Setup .NET 5
-      uses: actions/setup-dotnet@v1
-      with:
-        dotnet-version: 5.0.*
-    - name: Setup .NET 6
-      uses: actions/setup-dotnet@v1
-      with:
-        dotnet-version: 6.0.*
-    - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
-      with:
-        dotnet-version: 3.1.*
-    - name: Build with dotnet
-      run: ./build.sh --linksources=true --verbosity=verbose
-      shell: bash
+      - uses: actions/checkout@v3
+      - name: Setup .NET 5
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: 5.0.*
+      - name: Setup .NET 6
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: 6.0.*
+      - name: Setup .NET Core
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: 3.1.*
+      - name: Build with dotnet
+        run: ./build.sh --linksources=true --verbosity=verbose
+        shell: bash