Grant try and perf access to gsoc-contributors

Contributors may potentially work on performance, or on other things
that benefit from try access. We trust gsoc-contributors to not abuse
this access.

Author: joshtriplett

teams/gsoc-contributors.toml

@@ -17,6 +17,8 @@ members = [
 
 [permissions]
 dev-desktop = true
+bors.rust.try = true
+perf = true
 
 [[zulip-groups]]
 name = "gsoc-contributors"