[spec] setup-dotnet bump to 4.3

Author: i4004

.github/workflows/build.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v4.1.1
 
       - name: Install DotNet
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v4.3
 
       - name: Restore Dependencies
         run: dotnet restore