Update build-telerik-showcase.yml

Author: ashotkhachatryan

.github/workflows/build-telerik-showcase.yml

@@ -41,7 +41,7 @@ jobs:
         uses: rlespinasse/[email protected]
       - uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: '6.0.202'
+          dotnet-version: '7.0.200'
       - name: Clone Telerik Showcase
         uses: actions/checkout@v2
         with: