Pinned dotnet-ilverify to 8.0.0

Author: seesharper

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Install dotnet-script
         run: dotnet tool install --global dotnet-script
       - name: Install dotnet-ilverify
-        run: dotnet tool install --global dotnet-ilverify
+        run: dotnet tool install --global dotnet-ilverify --version 8.0.0
 
       - name: Run build script
         run: dotnet-script build/build.csx