.mailmap: add an alias for Varad Gautam

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index 263a994..6cb164c 100644
--- a/.mailmap
+++ b/.mailmap
@@ -608,6 +608,8 @@
 Vadym Shovkoplias <vadym.shovkoplias@globallogic.com>
 Vadym Shovkoplias <vadym.shovkoplias@globallogic.com> <vadim.shovkoplias@gmail.com>
 
+Varad Gautam <varad.gautam@collabora.com> <varadgautam@gmail.com>
+
 Ville Syrjälä <ville.syrjala@linux.intel.com> Ville Syrjala <syrjala@freedesktop.org>
 Ville Syrjälä <ville.syrjala@linux.intel.com> Ville Syrjala <syrjala@sci.fi>