fix: rename URL?.canonical.swift to URLOptional.canonical.swift for Windows compatibility

The question mark character in filenames is not allowed on Windows file systems,
causing CI failures during git checkout. Renamed to URLOptional.canonical.swift
to maintain cross-platform compatibility.

Author: coenttb

…es/ServerFoundation/URL?.canonical.swift …erFoundation/URLOptional.canonical.swiftSources/ServerFoundation/URL?.canonical.swift renamed to Sources/ServerFoundation/URLOptional.canonical.swift Sources/ServerFoundation/URL?.canonical.swift renamed to Sources/ServerFoundation/URLOptional.canonical.swift

@@ -1,5 +1,5 @@
 //
-//  URL?.canonical.swift
+//  URLOptional.canonical.swift
 //  coenttb-web
 //
 //  Created by Coen ten Thije Boonkkamp on 22/08/2024.