Upgrade to Rust 1.86 and bump MSRV to 1.84 (#17171)

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## Summary

I decided to disable the new
[`needless_continue`](https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue)
rule because I often found the explicit `continue` more readable over an
empty block or having to invert the condition of an other branch.


## Test Plan

`cargo test`

---------

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

crates/ruff_python_resolver/src/native_module.rs

@@ -31,7 +31,7 @@ pub(crate) fn is_native_module_file_name(module_name: &str, file_name: &Path) ->
         .is_some_and(is_native_module_file_extension)
     {
         return false;
-    };
+    }
 
     // The file must represent the module name.
     native_module_name(file_name) == Some(module_name)