Fix the test/Serialization/Recovery/types-5-to-4.swift test string to match Swift version 5.10

Author: shahmishal

test/Serialization/Recovery/types-5-to-4.swift

@@ -16,8 +16,8 @@ import Lib
 func requiresConformance(_: B_RequiresConformance<B_ConformsToProto>) {}
 func requiresConformance(_: B_RequiresConformance<C_RelyOnConformanceImpl.Assoc>) {}
 
-class Sub: Base {} // expected-error {{cannot inherit from class 'Base' (compiled with Swift 6.0) because it has overridable members that could not be loaded in Swift 4.1.50}}
-class Impl: Proto {} // expected-error {{type 'Impl' cannot conform to protocol 'Proto' (compiled with Swift 6.0) because it has requirements that could not be loaded in Swift 4.1.50}}
+class Sub: Base {} // expected-error {{cannot inherit from class 'Base' (compiled with Swift 5.10) because it has overridable members that could not be loaded in Swift 4.1.50}}
+class Impl: Proto {} // expected-error {{type 'Impl' cannot conform to protocol 'Proto' (compiled with Swift 5.10) because it has requirements that could not be loaded in Swift 4.1.50}}
 
 #else // TEST