skip install .net 9-10 / runner images already have it (8-10)

Author: mpreyskurantov

.github/actions/dotnet-test-build/action.yml

@@ -5,13 +5,6 @@ runs:
   using: "composite"
 
   steps:
-  - uses: actions/setup-dotnet@v4
-    with:
-      dotnet-quality: ga
-      dotnet-version: |
-        9.0
-        10.0.x
-
   - uses: actions/cache@v4
     with:
       key: ${{ runner.os }}-nuget-${{ hashFiles('net/**/*.csproj') }}