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.cpp

@@ -32,7 +32,7 @@ DeclarativeEnvironment::DeclarativeEnvironment(Environment* parent_environment)
 {
 }
 
-DeclarativeEnvironment::DeclarativeEnvironment(Environment* parent_environment, Span<Binding const> bindings)
+DeclarativeEnvironment::DeclarativeEnvironment(Environment* parent_environment, ReadonlySpan<Binding> bindings)
     : Environment(parent_environment)
     , m_bindings(bindings)
 {