UCO Issue 491: Bump UCO to remove owl:ontologyIRI concept review

[ajnelson-nist]

This Pull Request is a downstream component of the resolution of UCO Issue 491.

Coordination

• [x] Pull Request is against correct branch
• [x] Pull Request is in, or reverted to, Draft status before Solutions Approval vote has passed.
• [x] CI passes in CASE feature branch
• [x] CI passes in CASE current unstable branch tracking UCO's unstable as submodule (3ac5480)
• [x] Impact on SHACL validation reviewed for CASE-Examples
• [x] Impact on SHACL validation remediated for CASE-Examples (N/A)
• [x] Impact on SHACL validation reviewed for casework.github.io
• [x] Impact on SHACL validation remediated for casework.github.io (N/A)
• [x] Milestone linked
• [x] Solutions Approval vote logged on corresponding Issue (once logged, can be taken out of Draft PR status)
• [x] UCO PR 492 merged.