[ksqlDB.RestApi.Client]: updated action versions in dotnet github worflow

Author: tomasfabian

.github/workflows/dotnet.yml

@@ -7,28 +7,15 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    env:
-      ksqlDB_Test_Project_Path: Tests/ksqlDB.RestApi.Client.Tests/ksqlDb.RestApi.Client.Tests.csproj
-
     steps:
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Setup .NET 8.0
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: 8.0.205
 
-    - name: Setup .NET 7.0
-      uses: actions/setup-dotnet@v2
-      with:
-        dotnet-version: 7.0.x
-
-    - name: Setup .NET 6.0
-      uses: actions/setup-dotnet@v2
-      with:
-        dotnet-version: 6.0.x
-
     - name: Clean
       run: dotnet clean ksqlDb.RestApi.Client.sln --configuration Release && dotnet nuget locals all --clear
     - name: Install dependencies