Fix 8.1-lowest build

tests/deprecations-8.1.json

@@ -88,5 +88,10 @@
         "location": "Composer\\Test\\Package\\Archiver\\ArchivableFilesFinderTest::testManualExcludes",
         "message": "Return type of Symfony\\Component\\Finder\\Iterator\\CustomFilterIterator::accept() should either be compatible with FilterIterator::accept(): bool, or the #[\\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice",
         "count": 1
+    },
+    {
+        "location": "Composer\\Test\\Package\\Archiver\\ArchivableFilesFinderTest::testManualExcludes",
+        "message": "Return type of Symfony\\Component\\Finder\\Iterator\\SortableIterator::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice",
+        "count": 1
     }
 ]