fix(uptime) Add a missing task import for uptime (#104104)

Fixes SENTRY-5B8Y

Author: markstory

src/sentry/conf/server.py

@@ -921,6 +921,7 @@ def SOCIAL_AUTH_DEFAULT_USERNAME() -> str:
     "sentry.tasks.web_vitals_issue_detection",
     "sentry.tasks.weekly_escalating_forecast",
     "sentry.tempest.tasks",
+    "sentry.uptime.autodetect.notifications",
     "sentry.uptime.autodetect.tasks",
     "sentry.uptime.rdap.tasks",
     "sentry.uptime.subscriptions.tasks",