use correct framework
same as https://github.com/2881099/csredis/pull/514
@2881099, even .net team is having a hard time updating to 10 https://github.com/dotnet/runtime/pull/106599#discussion_r1721809662, imagine what will happen when 50 60 70 and 80 versions will come along. this is working by accident. it's best to use documented versions https://learn.microsoft.com/en-us/dotnet/standard/frameworks#supported-target-frameworks.
other failures are unrelated and happening on other PRs too. we should separate net452 example project from the sln file and maybe build it on windows-latest action?
other pr where it failed https://github.com/2881099/FreeRedis/actions/runs/10750136244/job/29816156765