Update a reference with PR involved via API will accidentally close the PR

[nekolab]

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Bug

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API doc: https://docs.github.com/en/rest/git/refs?apiVersion=2022-11-28#update-a-reference

Existing discussion: octokit/octokit.js#1373

Steps to reproduce the issue:

1. open a PR pointing to a specific ref.
2. update the ref that the above PR points to, forcing the ref to point at the sha at the head of the master.
3. add a couple of files to the branch.

Expected behavior:
The PR created in step 1 will remain open state

Actual behavior:
The PR created in step 1 closed

The "force update reference" should behave like git push --force and not affect any PR