migrate to api 2026-03-10

https://docs.github.com/en/rest/about-the-rest-api/breaking-changes?apiVersion=2026-03-10

Start by reviewing the linked GitHub REST API breaking-changes documentation for version 2026-03-10, then identify which repository entry points, API calls, and tests are affected. Done means the server is compatible with the new API version and the relevant tests pass, but the issue does not name affected files or endpoints.

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