Fix borrow in drop_indices patch — iterate Vec by reference

cargo failed with E0308 expected &Arc<Index>, found Arc<Index> on
`alloc_cursor_index(None, index)`. The original code iterated over
an iterator yielding &Arc<Index>; collecting into Vec<Arc<Index>> and
iterating with `for index in indices` yields owned Arc<Index>.

Iterate `for index in &indices` so `index` matches the original
&Arc<Index> binding. Verified with a local cargo check against
375f5d55e26aa90c54abaadce7e035d8d0c6893d.

Author: JanJakes

.github/workflows/phpunit-tests-turso.yml

@@ -707,7 +707,7 @@ jobs:
               "    let indices: Vec<_> = resolver.with_schema(database_id, |s| {\n"
               "        s.get_indices(tbl_name.name.as_str()).cloned().collect()\n"
               "    });\n"
-              "    for index in indices {\n"
+              "    for index in &indices {\n"
           )
           assert old in s, 'translate_drop_table get_indices block not found'
           open(p, 'w').write(s.replace(old, new, 1))