Pause assignments to @xFrednet for summer break 🏖️

I'm only removing myself from the assignment roulette as I want to allow `r? xFrednet` for `gh-pages` and other updates. So feel free to still `r?` me.

Author: xFrednet

triagebot.toml

@@ -32,7 +32,6 @@ users_on_vacation = [
 "*" = [
     "@Manishearth",
     "@llogiq",
-    "@xFrednet",
     "@Alexendoo",
     "@dswij",
     "@Jarcho",