.NET Version updated

Author: cs-raj

.github/workflows/unit-test.yml

@@ -9,8 +9,10 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4.2.2
-      - name: Setup .NET Core @ Latest
+      - name: Setup .NET 7.0
         uses: actions/setup-dotnet@v4.3.0
+        with:
+          dotnet-version: '7.0.x'
       - name: Restore dependencies
         run: dotnet restore Contentstack.Net.sln
       - name: Build solution