Adopt prerelease tags of swift-syntax-601. (#847)

This PR moves our main branch's swift-syntax dependency from 600.0.0 to
601.

### Checklist:

- [x] Code and documentation should follow the style of the [Style
Guide](https://github.com/apple/swift-testing/blob/main/Documentation/StyleGuide.md).
- [x] If public symbols are renamed or modified, DocC references should
be updated.

Package.swift

@@ -33,7 +33,7 @@ let package = Package(
   ],
 
   dependencies: [
-    .package(url: "https://github.com/swiftlang/swift-syntax.git", from: "600.0.0"),
+    .package(url: "https://github.com/swiftlang/swift-syntax.git", from: "601.0.0-latest"),
   ],
 
   targets: [

Sources/TestingMacros/CMakeLists.txt

@@ -31,7 +31,7 @@ if(SwiftTesting_BuildMacrosAsExecutables)
   set(FETCHCONTENT_BASE_DIR ${CMAKE_BINARY_DIR}/_d)
   FetchContent_Declare(SwiftSyntax
     GIT_REPOSITORY https://github.com/swiftlang/swift-syntax
-    GIT_TAG cb53fa1bd3219b0b23ded7dfdd3b2baff266fd25) # 600.0.0
+    GIT_TAG 1cd35348b089ff8966588742c69727205d99f8ed) # 601.0.0-prerelease-2024-11-18
   FetchContent_MakeAvailable(SwiftSyntax)
 endif()
 

Sources/TestingMacros/SuiteDeclarationMacro.swift

@@ -19,6 +19,7 @@ public struct SuiteDeclarationMacro: MemberMacro, PeerMacro, Sendable {
   public static func expansion(
     of node: AttributeSyntax,
     providingMembersOf declaration: some DeclGroupSyntax,
+    conformingTo protocols: [TypeSyntax],
     in context: some MacroExpansionContext
   ) throws -> [DeclSyntax] {
     guard _diagnoseIssues(with: declaration, suiteAttribute: node, in: context) else {