dotnet9 in build

Author: kerryjiang

.github/workflows/build.yaml

@@ -13,7 +13,7 @@ jobs:
             - name: Setup .NET Core
               uses: actions/setup-dotnet@v3
               with:
-                dotnet-version: '8.0.x'
+                dotnet-version: '9.0.x'
             - name: Set env
               run: |
                 echo "DOTNET_CLI_TELEMETRY_OPTOUT=1" >> $GITHUB_ENV

.github/workflows/myget_release.yaml

@@ -8,7 +8,7 @@ jobs:
             - name: Setup .NET Core
               uses: actions/setup-dotnet@v3
               with:
-                dotnet-version: '8.0.x'
+                dotnet-version: '9.0.x'
             - name: Set env
               run: echo "DOTNET_CLI_TELEMETRY_OPTOUT=1" >> $GITHUB_ENV
             - uses: dotnet/nbgv@master