fix(script_plugins): replace TyCtxt::{get_attrs -> get_attrs_unchecked}

[rust-lang/rust#95562][1] renames the existing method `get_attrs` to
`get_attrs_unchecked` and introduces a new method in its former place.
The new method takes an attribute name and returns attributes of that
name. It also checks that, if the attribute name is marked as local-
only, the given `DefId` is local as well to prevent misuses. The old
method, now named `get_attrs_unchecked`, returns all attributes of a
given `DefId`; thus it's "unchecked" in the sense that it's up to the
callers to be certain whether the attributes they are looking for are
local-only.

The new `get_attrs` method lacks the support for attribute names with
more than one path component, which is why we can't just migrate to the
new `get_attrs` method here. Although `get_attrs_unchecked` is marked
for future removal in the compile source code, there's a discussion
about [supporting][2] this use case.

[1]: rust-lang/rust#95562
[2]: https://github.com/rust-lang/rust/pull/95562/files#r915537557

Author: yvt

components/script_plugins/lib.rs

@@ -110,7 +110,8 @@ fn is_unrooted_ty<'tcx>(
         };
         let recur_into_subtree = match t.kind() {
             ty::Adt(did, substs) => {
-                let has_attr = |did, name| has_lint_attr(sym, &cx.tcx.get_attrs(did), name);
+                let has_attr =
+                    |did, name| has_lint_attr(sym, &cx.tcx.get_attrs_unchecked(did), name);
                 if has_attr(did.did(), sym.must_root) {
                     ret = true;
                     false