bump recursion limit, as suggested by compiler error

error[E0275]: overflow evaluating the requirement `tokio_epoll_uring::system::slots::SlotHandle: std::marker::Send`
       |
       = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`pageserver`)

pageserver/src/lib.rs

@@ -1,3 +1,4 @@
+#![recursion_limit = "300"]
 #![deny(clippy::undocumented_unsafe_blocks)]
 
 mod auth;