Fix build for swift-wasm (#76)

## Description

Hi There, thank you for this library it very cool!

I have a project that targets a server side swift and a web assembly
build and it's currently failing to build for Web Assembly.
Web Assembly uses the same library as linux but comes with a different
OS check so it needs that small fix to compile

Thank you!

## Type of Change

- [X ] Bug fix
- [ ] New feature
- [ ] Breaking change
- [ ] Documentation update

## Additional Notes

Author: ls-bertrand-landry-hetu

Sources/JSONSchema/Dialect.swift

@@ -126,7 +126,7 @@ public enum Dialect: String, Hashable, Sendable {
     let metaDictionary: [String: JSONValue] =
       try metaURLs?
       .reduce(into: [:]) { result, url in
-        #if os(Linux)
+        #if os(Linux) || os(WASI)
           guard url.lastPathComponent?.hasPrefix("schema") == false else { return }
           let value = try jsonValue(from: url as URL)
           let uriString =