[Test] Fix Runtime/protocol_conformance_collision.swift on 11.3+.
[Test] Fix Runtime/protocol_conformance_collision.swift on 11.3+.

This test checks the OS version to decide how to operate but that check isn't right. Revert to a fake future version.

rdar://77389722

ahoppen/swift,hooman/swift,xwu/swift,rudkx/swift,benlangmuir/swift,apple/swift,parkera/swift,ahoppen/swift,roambotics/swift,JGiola/swift,roambotics/swift,JGiola/swift,roambotics/swift,roambotics/swift,glessard/swift,parkera/swift,atrick/swift,JGiola/swift,atrick/swift,tkremenek/swift,gregomni/swift,gregomni/swift,benlangmuir/swift,hooman/swift,parkera/swift,ahoppen/swift,apple/swift,ahoppen/swift,benlangmuir/swift,benlangmuir/swift,xwu/swift,hooman/swift,roambotics/swift,atrick/swift,gregomni/swift,xwu/swift,glessard/swift,parkera/swift,rudkx/swift,parkera/swift,JGiola/swift,tkremenek/swift,atrick/swift,hooman/swift,tkremenek/swift,apple/swift,parkera/swift,xwu/swift,xwu/swift,tkremenek/swift,tkremenek/swift,rudkx/swift,apple/swift,hooman/swift,xwu/swift,ahoppen/swift,tkremenek/swift,glessard/swift,apple/swift,glessard/swift,atrick/swift,gregomni/swift,tkremenek/swift,parkera/swift,hooman/swift,gregomni/swift,rudkx/swift,JGiola/swift,ahoppen/swift,benlangmuir/swift,apple/swift,parkera/swift,rudkx/swift,glessard/swift,hooman/swift,rudkx/swift,JGiola/swift,roambotics/swift,benlangmuir/swift,gregomni/swift,xwu/swift,atrick/swift,glessard/swift