[test] api-digester: Add false positives for newly generalized properties

Author: lorentey

test/api-digester/Outputs/stability-stdlib-source-base.swift.expected

@@ -367,3 +367,7 @@ Struct CollectionOfOne is now with @_addressableForDependencies
 
 Protocol CodingKey has added inherited protocol SendableMetatype
 Protocol Error has added inherited protocol SendableMetatype
+
+Accessor Optional.unsafelyUnwrapped.Get() has generic signature change from <Wrapped> to <Wrapped where Wrapped : ~Escapable>
+Accessor UnsafeBufferPointer.indices.Get() has generic signature change from <Element> to <Element where Element : ~Copyable>
+Accessor UnsafeMutableBufferPointer.indices.Get() has generic signature change from <Element> to <Element where Element : ~Copyable>