Transition away from deprecated keys

> The top-level key `about:` will be deprecated in favor of
> `description:`. Please use `description:` instead of `about:`.

Author: pradyunsg

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -1,5 +1,5 @@
 name: Bug report
-about: Something is not working correctly.
+description: Something is not working correctly.
 title: ""
 labels: "S: needs triage, type: bug"