🍒[5.9][Executors] Remove accidentally added availability on asUnownedSerial Executor #65409
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Description: The previously existing declaration of the protocol requirement did accidentally gain an SwiftStdlib 5.9 availability, while only the default implementation should (we added a default impl that implements using the UnownedSerialExecutor(ordinary:) and that properly has the 5.9 availability.)
Risk: Low, this undoes a too restrictive limitation being added
Review by: @DougGregor @tbkka
Testing: CI testing, automation caught this regression
Original PR: #65407
Radar: rdar://108447637