Existential `any` does not seem to be required in Swift 6 mode

[Jumhyn (Frederick Kellison-Linn)]

You’ve not misunderstood, just missed the update that @vns mentioned!

@hborla

Given the concerns about migration to consistent use of existential any in the language, and the expectation that additional language improvements will be coming that might affect the end result of that migration, the Language Steering Group is deferring the source-incompatible changes in SE-0335 to a future language revision.