bump dotnet version of build

Author: marzent

.github/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 9.0.x
     - name: Download Dalamud
       shell: pwsh
       run: |