Update boilerplate files in older work item repo templates

After TSC review of this catch-all work item template (https://github.com/decentralized-identity/template-for-work-items), ensure older, specialized work item repo templates are up-to-date. That includes:

- https://github.com/decentralized-identity/template-for-registry-workitems
- https://github.com/decentralized-identity/template-for-profile-workitems
- https://github.com/decentralized-identity/template-IETF-bound

Start by reviewing the catch-all template-for-work-items repository referenced in the issue, then compare its boilerplate with template-for-registry-workitems, template-for-profile-workitems, and template-IETF-bound. Done means the older specialized repositories have boilerplate files updated to match the reviewed catch-all template, though the issue does not specify which files or changes are required.

Written by the indexing model from the issue text.