Update setup-dotnet in gh actions (#12261)

.github/workflows/build-docfx.yml

@@ -4,10 +4,10 @@ on:
   schedule:
     - cron: "0 0 * * 0"
 
-jobs:    
+jobs:
   docfx:
    runs-on: ubuntu-latest
-   steps: 
+   steps:
     - uses: actions/checkout@v2
     - name: Setup submodule
       run: |
@@ -19,23 +19,23 @@ jobs:
         cd RobustToolbox/
         git submodule update --init --recursive
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v3
       with:
         dotnet-version: 6.0.x
-        
+
     - name: Install dependencies
       run: dotnet restore
-      
+
     - name: Build Project
       run: dotnet build --no-restore /p:WarningsAsErrors=nullable
 
     - name: Build DocFX
-      uses: nikeee/docfx-action@v1.0.0      
+      uses: nikeee/docfx-action@v1.0.0
       with:
         args: Content.Docfx/docfx.json
-    
+
     - name: Publish Docfx Documentation on GitHub Pages
       uses: maxheld83/ghpages@master
       env:
-        BUILD_DIR: Content.Docfx/_content-site 
-        GH_PAT: ${{ secrets.GH_PAT }} 
+        BUILD_DIR: Content.Docfx/_content-site
+        GH_PAT: ${{ secrets.GH_PAT }}