simplify hash without frozen error message

Co-authored-by: David Hewitt <[email protected]>

Author: Icxolu

pyo3-macros-backend/src/pyclass.rs

@@ -1672,7 +1672,7 @@ fn pyclass_hash(
     ctx: &Ctx,
 ) -> Result<(Option<syn::ImplItemFn>, Option<MethodAndSlotDef>)> {
     if options.hash.is_some() && options.frozen.is_none() {
-        bail_spanned!(options.hash.span() => "The `hash` option can only be using in conjunction with `frozen`.");
+        bail_spanned!(options.hash.span() => "The `hash` option requires the `frozen` option.");
     }
     // FIXME: Use hash.map(...).unzip() on MSRV >= 1.66
     match options.hash {

tests/ui/invalid_pyclass_args.stderr

@@ -58,7 +58,7 @@ error: a `#[pyclass]` cannot be both a `mapping` and a `sequence`
 31 | struct CannotBeMappingAndSequence {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: The `hash` option can only be using in conjunction with `frozen`.
+error: The `hash` option requires the `frozen` option.
   --> tests/ui/invalid_pyclass_args.rs:36:11
    |
 36 | #[pyclass(hash)]

tests/ui/invalid_pyclass_enum.stderr

@@ -30,7 +30,7 @@ error: `constructor` can't be used on a simple enum variant
 26 |     #[pyo3(constructor = (a, b))]
    |            ^^^^^^^^^^^
 
-error: The `hash` option can only be using in conjunction with `frozen`.
+error: The `hash` option requires the `frozen` option.
   --> tests/ui/invalid_pyclass_enum.rs:37:11
    |
 37 | #[pyclass(hash)]