diffoscope: upgrade 301 -> 306

diffoscope: upgrade 301 -> 306

Changelog:
302:
* Mask stderr from the extract-vmlinux script.
* Make it much more explicit that we return 'success' from the
  extract-vmlinux script instead of just falling through to the bottom of the
  script.
* Use Difference.from_operation in an attempt to pipeline the output of
  extract-vmlinux, potentially avoiding it all residing in memory. This is an
  attempt to prevent out of memory issues on try.diffoscope.org.
* Use --print-armap long option with nm in the "ar" comparator for wider
  compatibility.

303:
* Don't check for PyPDF version 3 specifically, check for >= 3. Thanks,
  Vagrant, for the patch.
* Ensure that Java class files are named .class on the filesystem before
  passing them to javap(1).
* Update copyright years.

304:
* Do not run jsondiff on files over 100KiB as the algorithm runs in O(n^2)
  time.
* Fix test after the upload of systemd-ukify 258~rc3 (vs. 258~rc2).
* Move from a mono-utils dependency to versioned "mono-devel | mono-utils"
  dependency, taking care to maintain the riscv64 architecture
  restriction.
* Use sed -ne over awk -F= to to avoid mangling dependency lines containing
  equals signs (=), for example version restrictions.
* Use sed backreferences when generating debian/tests/control to avoid DRY
  violations.
* Update copyright years.
* Avoid a crash in the HTML presenter when page limit is None.

305:
Upload to unstable/sid after the release of trixie.

306:
* Fix compatibility with RPM 6.
* Use regular 'open' calls instead of the deprecated 'codecs.open'.
* Accept additional 'v' when calling 'fdtump --version'.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>