Update SerenityOS JBIG2 test files

https://github.com/SerenityOS/serenity/compare/fc2e3fdc5f2ce926cdf14...38ebe688245ac2395

Not sure if there's a way to limit the comparison to just the
Tests/LibGfx/test-inputs/jbig2/json folder:

https://github.com/SerenityOS/serenity/commits/master/Tests/LibGfx/test-inputs/jbig2/json

PDFium passes all the new tests.

Bug: 42271957
Change-Id: I71c098ad8374e653b473d6c83acd2a54a015c37d
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/138590
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nico Weber <thakis@google.com>