Update release doc for Trusted Publishing

[harmony7]

Change summary

This PR updates RELEASE.md to reflect the recent change to switch to Trusted Publishing.

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

N/A

Changes to Core Features:

N/A

User Impact

none

Are there any considerations that need to be addressed for release?

none

[philippschulte]

Thank you!