Remove myself from rotation (#16905)

I'll be away for around ten days. Apparently, setting oneself out of
rotation using triagebot is not enough.

changelog: none

r? ghost

Author: samueltardieu

triagebot.toml

@@ -93,6 +93,7 @@ users_on_vacation = [
     "Alexendoo",
     "y21",
     "blyxyas",
+    "samueltardieu",
 ]
 
 [assign.owners]