Use net9 in ci.yml

Author: angularsen

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
       with:
         dotnet-version: |
           6.0.x
-          8.0.x
+          9.0.x
 
     - name: Setup .NET nanoFramework build components
       uses: nanoframework/nanobuild@v1
@@ -101,9 +101,11 @@ jobs:
     - name: Setup .NET SDK
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: 9.0.x
 
     - name: Push to nuget.org
+      env:
+        NUGET_ORG_APIKEY: ${{ secrets.NUGET_ORG_APIKEY }}
       run: |
-        dotnet nuget push "**/*.nupkg" --skip-duplicate --api-key ${{ secrets.NUGET_ORG_APIKEY }} --source https://api.nuget.org/v3/index.json
-      working-directory: nugets
+        dotnet nuget push "**/*.nupkg" --skip-duplicate --api-key $NUGET_ORG_APIKEY --source https://api.nuget.org/v3/index.json
+      working-directory: nugets