sysutils/py-diffoscope: Update to 147

• Add upstream [1] patch to prevent tlsh dependent tests from failing

Changelog:

145: https://lists.reproducible-builds.org/pipermail/rb-general/2020-May/001947.html
146: https://lists.reproducible-builds.org/pipermail/rb-general/2020-May/001948.html
147: https://lists.reproducible-builds.org/pipermail/rb-general/2020-June/001964.html

[1] https://lists.reproducible-builds.org/pipermail/diffoscope/2020-June/002642.html

PR: 246773
Submitted by: Fabian Keil <fk fabiankeil de>
MFH: No (combined feature/bugfix releases)