fix(discord): extend bot-task cancellation to connect()'s generic exception branch

Follow-up to #44389: the generic 'except Exception' branch in connect()
had the same orphaned-task hazard as the timeout branch. Extract the
cancel-and-await logic into _cancel_bot_task() and call it from all
three sites (timeout branch, exception branch, disconnect()).

Also adds deaneeth to AUTHOR_MAP.

scripts/release.py

@@ -63,6 +63,7 @@ AUTHOR_MAP = {
     "thomas.paquette@gmail.com": "RyTsYdUp",
     "techxacm@gmail.com": "ProgramCaiCai",
     "266365592+bmoore210@users.noreply.github.com": "bmoore210",
+    "123150002+deaneeth@users.noreply.github.com": "deaneeth",
     "157839748+psionic73@users.noreply.github.com": "psionic73",
     "manishbyatroy@gmail.com": "manishbyatroy",
     "chilltulpa@gmail.com": "TheGardenGallery",