[SwiftFixIt] Don't borrow 'SourceFile' in 'fixIt' and 'highlights' APIs

Author: xedin

Sources/SwiftFixIt/SwiftFixit.swift

@@ -323,7 +323,7 @@ extension DiagnosticConverter {
     // emit notes with those fix-its.
     private static func fixIt(
         from diagnostic: borrowing some AnyDiagnostic,
-        in sourceFile: borrowing SourceFile
+        in sourceFile: /*borrowing*/ SourceFile
     ) throws -> SwiftDiagnostics.FixIt {
         let changes = try diagnostic.fixIts.map { fixIt in
             let startPosition = try sourceFile.position(of: fixIt.start)
@@ -341,7 +341,7 @@ extension DiagnosticConverter {
 
     private static func highlights(
         from diagnostic: borrowing some AnyDiagnostic,
-        in sourceFile: borrowing SourceFile
+        in sourceFile: /*borrowing*/ SourceFile
     ) throws -> [Syntax] {
         try diagnostic.ranges.map { startLocation, endLocation in
             let startPosition = try sourceFile.position(of: startLocation)