feat: Add @sendable annotations for Swift 6 support

Author: kevinrenskers

Sources/SagaUtils/SwiftSoupProcessor.swift

@@ -18,8 +18,8 @@ import SwiftSoup
 /// )
 /// ```
 public func swiftSoupProcessor<M>(
-  _ transformations: ((Document, Item<M>) throws -> Void)...
-) -> (Item<M>) async -> Void {
+  _ transformations: (@Sendable (Document, Item<M>) throws -> Void)...
+) -> @Sendable (Item<M>) async -> Void {
   return { item in
     do {
       let doc = try SwiftSoup.parseBodyFragment(item.body)

Sources/SagaUtils/SwiftSoupTransformations.swift

@@ -24,7 +24,7 @@ public func generateTOC<M>(_ doc: Document, item: Item<M>) throws {
 ///
 /// Also adds heading anchors, so there is no need to also use ``addHeadingAnchors``.
 /// - Parameter placeholder: The placeholder string to look for.
-public func generateTOC<M>(placeholder: String) -> (Document, Item<M>) throws -> Void {
+public func generateTOC<M>(placeholder: String) -> @Sendable (Document, Item<M>) throws -> Void {
   return { doc, _ in
     try _generateTOC(doc, placeholder: placeholder)
   }