feat: install xsltproc, because it's a necessary prerequisite for Rosetta 8.3+

tasks/rosetta/install_packages.yml

@@ -5,5 +5,6 @@
       'libtiff',
       'perl-Image-ExifTool',
       'slubarchiv-xml-catalog',
+      'xsltproc',   # For bundled Exiftool and Mediainfo metadata extractors in Rosetta 8.3 and later.
     ]
-    state: latest
+    state: latest
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