Fix 'error: ProcessInfo initializer is inaccessible due to internal protection level'

Author: mattt

Tests/SwiftDocTests/Helpers/temporaryFile.swift

@@ -1,7 +1,7 @@
 import Foundation
 
 func temporaryFile(path: String? = nil, contents: String) throws -> URL {
-    let temporaryDirectoryURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(ProcessInfo().globallyUniqueString)
+    let temporaryDirectoryURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(ProcessInfo.processInfo.globallyUniqueString)
     try FileManager.default.createDirectory(at: temporaryDirectoryURL, withIntermediateDirectories: true, attributes: [.posixPermissions: 0o766])
 
     let path = path ?? ProcessInfo().globallyUniqueString