Fix swift 6 concurrency issues (#107)

* fix: swift-tools-version declaration

* feat: add Sendable comformance to Node and its dependant types

* fix: Xcode 15 errors

updated swift-snapshot-testing

* refactor: fix snapshot-testing rename warnings

* test with swift:6.0-focal

Author: alephao

Makefile

@@ -3,7 +3,7 @@ test-linux:
 		--rm \
 		-v "$(PWD):$(PWD)" \
 		-w "$(PWD)" \
-		swift:5.7-focal \
+		swift:6.0-focal \
 		bash -c 'swift test'
 
 test-macos: xcodeproj

Package.resolved

@@ -1,4 +1,4 @@
-// swift-tools-version:5.5
+// swift-tools-version: 5.5
 import PackageDescription
 
 let package = Package(
@@ -17,7 +17,7 @@ let package = Package(
       targets: ["HtmlSnapshotTesting"]),
   ],
   dependencies: [
-    .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", from: "1.11.0")
+    .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", from: "1.11.1")
   ],
   targets: [
     .target(

Package.swift

@@ -1,5 +1,5 @@
 import Html
-import SnapshotTesting
+@preconcurrency import SnapshotTesting
 
 extension Snapshotting where Value == [Node], Format == String {
   public static var html: Snapshotting {

Sources/HtmlSnapshotTesting/HtmlSnapshotTesting.swift

@@ -496,7 +496,7 @@ final class SnapshotTestingTests: XCTestCase {
       )
     )
 
-    assertSnapshot(matching: doc, as: .html)
+    assertSnapshot(of: doc, as: .html)
   }
 
   func testSnapshots() {
@@ -642,6 +642,6 @@ final class SnapshotTestingTests: XCTestCase {
       .video(.track(src: "track1"), transparent: "Fallback"),
     ]
 
-    assertSnapshot(matching: doc, as: .html)
+    assertSnapshot(of: doc, as: .html)
   }
 }