Update XZ Utils to 5.0.3 (in deps)

tests/files/README

 
 .xz Test Files
 ----------------
 
 0. Introduction
 
     This directory contains bunch of files to test handling of .xz files
     in .xz decoder implementations. Many of the files have been created
     by hand with a hex editor, thus there is no better "source code" than
     the files themselves. All the test files (*.xz) and this README have
@@ skipping 69 matching lines @@
     the state without specifying new properties.
 
     good-1-lzma2-3.xz has two LZMA2 chunks, of which the first is
     uncompressed and the second is LZMA. The first chunk resets dictionary
     and the second sets new properties.
 
     good-1-lzma2-4.xz has three LZMA2 chunks: First is LZMA, second is
     uncompressed with dictionary reset, and third is LZMA with new
     properties but without dictionary reset.
 
+    good-1-lzma2-5.xz has an empty LZMA2 stream with only the end of
+    payload marker. XZ Utils 5.0.1 and older incorrectly see this file
+    as corrupt.
+
     good-1-3delta-lzma2.xz has three Delta filters and LZMA2.
 
 
 2.2. Unsupported Files
 
     unsupported-check.xz uses Check ID 0x02 which isn't supported by
     the current version of the file format. It is implementation-defined
     how this file handled (it may reject it, or decode it possibly with
     a warning).
 
@@ skipping 123 matching lines @@
     bad-1-lzma2-5.xz is like bad-1-lzma2-4.xz but doesn't try to reset
     anything in the header of the second chunk.
 
     bad-1-lzma2-6.xz has reserved LZMA2 control byte value (0x03).
 
     bad-1-lzma2-7.xz has EOPM at LZMA level.
 
     bad-1-lzma2-8.xz is like good-1-lzma2-4.xz but doesn't set new
     properties in the third LZMA2 chunk.