patch workflow for dotnet tools not npm [skip ci]

Author: SimonDarksideJ

.github/workflows/pullrequest.yml

@@ -31,8 +31,8 @@ jobs:
         with:
           dotnet-version: '8.0.x'
 
-      - name: Restore NPM Packages
-        run: npm install
+      - name: Restore dotnet tools
+        run: dotnet tool restore
 
       - name: Build Site
         run: npm run build