fix Incorrect Group Handling in RequestContextHandler logger.go (#4082)

Wrap the grouped handler in requestContextHandler to preserve context attribute injection.
fixes #4081

Signed-off-by: alihasan070707 <52155098+alihasan070707@users.noreply.github.com>

cmd/dex/logger.go

@@ -63,5 +63,5 @@ func (h requestContextHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
 }
 
 func (h requestContextHandler) WithGroup(name string) slog.Handler {
-	return h.handler.WithGroup(name)
+	return requestContextHandler{h.handler.WithGroup(name)}
 }