[test] adjust api-digester data

Author: glessard

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

@@ -363,8 +363,6 @@ Func ContiguousArray.withUnsafeMutableBufferPointer(_:) is now without rethrows
 
 // Adoption of @_addressableForDependencies
 Struct CollectionOfOne is now with @_addressableForDependencies
-Struct String.UTF8View is now with @_addressableForDependencies
-Struct Substring.UTF8View is now with @_addressableForDependencies
 
 Protocol CodingKey has added inherited protocol SendableMetatype
 Protocol Error has added inherited protocol SendableMetatype

test/api-digester/stability-stdlib-abi-without-asserts.test

@@ -825,8 +825,7 @@ Func _SliceBuffer.withUnsafeMutableBufferPointer(_:) has mangled name changing f
 Struct String.Index has added a conformance to an existing protocol CustomDebugStringConvertible
 
 Struct CollectionOfOne is now with @_addressableForDependencies
-Struct String.UTF8View is now with @_addressableForDependencies
-Struct Substring.UTF8View is now with @_addressableForDependencies
+Struct _StringGuts is now with @_addressableForDependencies
 
 Enum _SwiftifyInfo is a new API without '@available'
 Enum _SwiftifyExpr is a new API without '@available'