chore: add dotnet 7.x

Author: kamal-kaur04

.github/workflows/sanity-workflow.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       max-parallel: 3
       matrix:
-        dotnet: ['6.0.x', '5.0.x']
+        dotnet: ['7.0.x', '6.0.x', '5.0.x']
         os: [ windows-latest ]
     name: NUnit Appium Repo ${{ matrix.dotnet }} - ${{ matrix.os }} Sample
     env: