types: update for 9.5
Issues and projects gained a `_links` field containing URLs of related APIs (see gitlab-ce MR 10491, commit v9.5.0-rc1~301^2). We model it but do not expose it publicly since our clients won't need it. Notes gained a `noteable_iid` when attached to issues and merge requests (see gitlab-ce MR 13265, commit v9.5.0-rc1~14^2).
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