update cloudflare worker dep to 0.0.18

[aifrim]

When trying to use libsql-client within a Cloudflare Worker environment I get this

error[E0432]: unresolved imports `syn::FnArg`, `syn::ImplItem`, `syn::Item`
 --> /home/aifrim/.cargo/registry/src/index.crates.io-6f17d22bba15001f/worker-macros-0.0.6/src/durable_object.rs:3:36
  |
3 | use syn::{spanned::Spanned, Error, FnArg, ImplItem, Item, Type, TypePath};
  |                                    ^^^^^  ^^^^^^^^  ^^^^ no `Item` in the root
  |                                    |      |
  |                                    |      no `ImplItem` in the root
  |                                    no `FnArg` in the root

error[E0432]: unresolved import `syn::ItemFn`
 --> /home/aifrim/.cargo/registry/src/index.crates.io-6f17d22bba15001f/worker-macros-0.0.6/src/event.rs:3:75
  |
3 | use syn::{parse_macro_input, punctuated::Punctuated, token::Comma, Ident, ItemFn};
  |                                                                           ^^^^^^ no `ItemFn` in the root

For more information about this error, try `rustc --explain E0432`.

Here is how it is defined in my Cargo.toml (since the latest changes

[dependencies]
libsql-client = { version = "0.31.10", default-features = false, features = [
    "worker",
    "workers_backend",
    "mapping_names_to_values_in_rows",
], git = "https://github.com/libsql/libsql-client-rs" }

And when I change the git url to my fork https://github.com/aifrim/libsql-client-rs the build works.