Fallback to requires-python in certain cases when target-version is not found (#16721)

## Summary

Restores https://github.com/astral-sh/ruff/pull/16319 after it got
dropped from the 0.10 release branch :(

---------

Co-authored-by: dylwil3 <dylwil3@gmail.com>

crates/ruff_server/src/logging.rs

@@ -64,6 +64,8 @@ pub(crate) fn init_logging(log_level: LogLevel, log_file: Option<&std::path::Pat
 
     tracing::subscriber::set_global_default(subscriber)
         .expect("should be able to set global default subscriber");
+
+    tracing_log::LogTracer::init().unwrap();
 }
 
 /// The log level for the server as provided by the client during initialization.