install-darwin: fix _nixbld uids for macOS sequoia (backport #10919) #11420
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Motivation
Starting in macOS 15 Sequoia, macOS daemon UIDs are encroaching on our default UIDs of 301-332. This commit relocates our range up to avoid clashing with the current UIDs of 301-304 and buy us a little time while still leaving headroom for people installing more than 32 users.
It also adopts GID 350 (same as first UID), since @emilazy pointed out that this will keep our build group from showing up in the Users & Groups interface. (See #10919 (comment))
Context
Priorities and Process
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This is an automatic backport of pull request #10919 done by [Mergify](https://mergify.com).