SwiftFixIt: Bring back Copyable suppression

The minimum Swift tools version is appropriate for noncopyable types.

Author: AnthonyLatsis

Sources/SwiftFixIt/SwiftFixIt.swift

@@ -107,7 +107,7 @@ extension SerializedDiagnostics.SourceLocation: AnySourceLocation, @retroactive
 extension SerializedDiagnostics.FixIt: AnyFixIt {}
 
 /// Encapsulates initial diagnostic skipping behavior.
-private struct PrimaryDiagnosticFilter<Diagnostic: AnyDiagnostic> {
+private struct PrimaryDiagnosticFilter<Diagnostic: AnyDiagnostic>: ~Copyable {
     /// A hashable type storing the minimum data necessary to uniquely identify
     /// a diagnostic for our purposes.
     struct DiagnosticID: Hashable {
@@ -192,7 +192,7 @@ private struct PrimaryDiagnosticFilter<Diagnostic: AnyDiagnostic> {
 }
 
 /// The backing API for `SwiftFixitCommand`.
-package struct SwiftFixIt /*: ~Copyable */ {
+package struct SwiftFixIt: ~Copyable {
     private typealias DiagnosticsPerFile = [SourceFile: [SwiftDiagnostics.Diagnostic]]
 
     private let fileSystem: any FileSystem
@@ -381,8 +381,8 @@ extension SourceFile: Hashable {
     }
 }
 
-private struct DiagnosticConverter /*: ~Copyable */ {
-    private struct SourceFileCache /*: ~Copyable */ {
+private struct DiagnosticConverter: ~Copyable {
+    private struct SourceFileCache: ~Copyable {
         private let fileSystem: any FileSystem
 
         private var sourceFiles: [AbsolutePath: SourceFile]