.mailmap: add an alias for Renato Caldas

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index 91ed4b2..409d9a0 100644
--- a/.mailmap
+++ b/.mailmap
@@ -495,6 +495,8 @@
 
 RALOVICH, Kristóf <tade60@freemail.hu> <kristof.ralovich@gmail.com>
 
+Renato Caldas <seventhguardian@gmail.com>
+
 Richard Li <richardradeon@gmail.com> <RichardZ.Li@amd.com>
 # The next ones are not 100% sure
 Richard Li <richardradeon@gmail.com> richard <richard@richard-desktop3.(none)>