Ensure bugs are associated by default with the correct UCX project (#3423)

## Changes

We've switched to a new UCX project. This PR updates the template for
new bugs so that they are associated with the new project that we're
using instead of the old one.

Author: asnare

.github/ISSUE_TEMPLATE/bug.yml

@@ -4,7 +4,7 @@ name: Bug Report
 description: Something is not working with UCX
 title: "[BUG]: "
 labels: ["bug", "needs-triage"]
-projects: ["databrickslabs/12"]
+projects: ["databrickslabs/13"]
 # assignees:
 #   - ucx-write
 body: