Everywhere: Use ReadonlySpan<T> instead of Span<T const>

Author: https://github.com/MacDue
Commit: 63b11030f0
Pull-request: https://github.com/SerenityOS/serenity/pull/17328
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h

@@ -70,7 +70,7 @@ private:
 protected:
     DeclarativeEnvironment();
     explicit DeclarativeEnvironment(Environment* parent_environment);
-    DeclarativeEnvironment(Environment* parent_environment, Span<Binding const> bindings);
+    DeclarativeEnvironment(Environment* parent_environment, ReadonlySpan<Binding> bindings);
 
     virtual void visit_edges(Visitor&) override;