.mailmap: add alias for Chenglei Ren

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index c6801fe..b83d9ba 100644
--- a/.mailmap
+++ b/.mailmap
@@ -117,6 +117,8 @@
 Chandu Babu Namburu <chandu@amd.com>
 Chandu Babu Namburu <chandu@amd.com> <mailto:chandu@amd.com>
 
+Chenglei Ren <chenglei.ren@intel.com>
+
 Chia-I Wu <olvaffe@gmail.com> <olv@lunarg.com>
 Chia-I Wu <olvaffe@gmail.com> Chia-Wu <olvaffe@gmail.com>