.mailmap: specify spelling for Francesco Ansanelli

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index 1e33a7b..0cd2681 100644
--- a/.mailmap
+++ b/.mailmap
@@ -217,6 +217,8 @@
 
 Feng, Haitao <haitao.feng@intel.com> Haitao Feng <haitao.feng@intel.com>
 
+Francesco Ansanelli <francians@gmail.com>
+
 Frank Binns <frank.binns@imgtec.com> <francisbinns@gmail.com>
 
 Frank Henigman <fjhenigman@google.com> <fjhenigman@chromium.org>