PDF: remove an unused JPX macro import

vendor/README.craft-reader.md

@@ -235,6 +235,9 @@ precision of the indices; an image without a palette keeps its own. Tests:
 PdfCraft's raster test `a_jp2_palette_keeps_its_colours_whatever_the_index_precision` is not
 ported: the unit tests show the same behavior.
 
+The JPX reader drops an unused `alloc::vec` import; its test macros already use
+`alloc::vec!`. The local source hash records this build-only cleanup.
+
 From [PdfCraft revision 0b670caf4a090e9d83a7f41a84b4cb2144a2d33e](https://github.com/storytold/pdfcraft/tree/0b670caf4a090e9d83a7f41a84b4cb2144a2d33e/vendor),
 unledgered and marked `PdfCraft patch` in the source: hayro-syntax #3438 (issue #3107), with
 its look-ahead bound from 01af6cba3. An inline image without a filter ends at the byte

vendor/hayro-syntax/SOURCE.json

@@ -164,7 +164,7 @@
       "path": "src/filter/jpx.rs",
       "source_sha256": "c9f068629c9cbe79af6793c3c125df4631ca1455691cb1335b44ff43cb1b4056",
       "source_git_blob": "74efd8b31e2b2935ff2bbceda2c1ffd36ea9c20d",
-      "sha256": "dc3742454cfde9a994ce48984e8fcb7b18851efb36ce2d62e31629efea063a1b"
+      "sha256": "81213936de6d1c6b63bea041a1f88a71753e3b4238a08d9bbc7dbdfaca0970a0"
     },
     {
       "path": "src/filter/lzw_flate.rs",

vendor/hayro-syntax/src/filter/jpx.rs

@@ -2,7 +2,6 @@ use crate::bit_reader::{BitWriter, bit_mask};
 use crate::filter::FilterResult;
 use crate::object::stream::{ImageColorSpace, ImageData, ImageDecodeParams};
 use alloc::borrow::Cow;
-use alloc::vec;
 use alloc::vec::Vec;
 use hayro_jpeg2000::{ColorSpace, DecodeSettings};