Add .NET 9 hints

Author: nullpainter

.github/workflows/coverage.yml

@@ -13,7 +13,9 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Setup .NET Core
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 9.0.x
       - name: Generate coverage report
         run: |
           dotnet test /p:CollectCoverage=true /p:CoverletOutput=TestResults/ /p:CoverletOutputFormat=lcov /p:CoverageOutput=coverage.info

.github/workflows/dotnet-core.yml

@@ -12,7 +12,9 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: 9.0.x      
     - name: Install dependencies
       run: dotnet restore
     - name: Build
@@ -26,7 +28,9 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: 9.0.x      
     - name: Install dependencies
       run: dotnet restore
     - name: Build

.github/workflows/release.yml

@@ -29,7 +29,9 @@ jobs:
         uses: actions/checkout@v1
 
       - name: Setup dotnet
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 9.0.x        
       - name: Build
         shell: bash
         run: |