Add missing dependency to SwiftSyntaxMacroExpansion.

Author: mbrandonw

Package.swift

@@ -194,7 +194,7 @@ let package = Package(
 
     .target(
       name: "SwiftSyntaxMacroExpansion",
-      dependencies: ["SwiftSyntax", "SwiftSyntaxBuilder", "SwiftSyntaxMacros", "SwiftDiagnostics"],
+      dependencies: ["SwiftSyntax", "SwiftSyntaxBuilder", "SwiftSyntaxMacros", "SwiftDiagnostics", "SwiftOperators"],
       exclude: ["CMakeLists.txt"]
     ),