chore(kernel/environment): fix style

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/kernel/environment.cpp

@@ -4,6 +4,8 @@ Released under Apache 2.0 license as described in the file LICENSE.
 
 Author: Leonardo de Moura
 */
+#include <utility>
+#include <vector>
 #include <limits>
 #include "kernel/environment.h"
 #include "kernel/kernel_exception.h"

src/kernel/environment.h

@@ -7,6 +7,7 @@ Author: Leonardo de Moura
 #pragma once
 #include <utility>
 #include <memory>
+#include <vector>
 #include "util/rc.h"
 #include "util/optional.h"
 #include "util/list.h"