Suppress compiler warnings, due to never type (!)

As per <https://github.com/rust-lang/rust/issues/123748>
! will no longer degrades into () which in this situation
breaks type deduction; so specify it explicitly.

config/src/lua.rs

@@ -276,7 +276,7 @@ end
         "#,
         )
         .set_name("=searcher")
-        .eval()
+        .eval::<()>()
         .context("replace package.searchers")?;
 
         wezterm_mod.set(