fix: remove dependency of SwiftParserDiagnostics

Author: RayZhao1998

Package.swift

@@ -186,10 +186,7 @@ let package = Package(
 
     .target(
       name: "SwiftSyntaxMacroExpansion",
-      dependencies: [
-        "SwiftSyntax", "SwiftSyntaxBuilder", "SwiftSyntaxMacros", "SwiftDiagnostics", "SwiftOperators",
-        "SwiftParserDiagnostics",
-      ],
+      dependencies: ["SwiftSyntax", "SwiftSyntaxBuilder", "SwiftSyntaxMacros", "SwiftDiagnostics", "SwiftOperators"],
       exclude: ["CMakeLists.txt"]
     ),
 

Sources/SwiftSyntaxMacroExpansion/MacroSystem.swift

@@ -16,7 +16,6 @@ internal import SwiftOperators
 @_spi(MacroExpansion) internal import SwiftParser
 public import SwiftSyntax
 internal import SwiftSyntaxBuilder
-internal import SwiftParserDiagnostics
 @_spi(MacroExpansion) @_spi(ExperimentalLanguageFeature) public import SwiftSyntaxMacros
 #else
 import SwiftDiagnostics
@@ -25,7 +24,6 @@ import SwiftOperators
 import SwiftSyntax
 import SwiftSyntaxBuilder
 @_spi(MacroExpansion) @_spi(ExperimentalLanguageFeature) import SwiftSyntaxMacros
-import SwiftParserDiagnostics
 #endif
 
 // MARK: - Public entry function