Update .NET Core version from 8.0.x to 9.0.x

Author: Niphyr

.github/workflows/dotnet-core-build-test.yml

@@ -17,7 +17,7 @@ jobs:
       uses: actions/setup-dotnet@v2
       with:
         dotnet-version: | 
-          8.0.x
+          9.0.x
     - name: Install dependencies
       run: dotnet restore
     - name: Build .NET Core
@@ -29,4 +29,4 @@ jobs:
       if: always()
       with:
         path: SimcProfileParser.Tests/TestResults/*.xml
-        access-token: ${{ secrets.GITHUB_TOKEN }}
+        access-token: ${{ secrets.GITHUB_TOKEN }}