sysutils/elephant: Update to 2.20.2

Changelog:

• https://github.com/abenz1267/elephant/releases/tag/v2.20.0
• https://github.com/abenz1267/elephant/releases/tag/v2.20.1
• https://github.com/abenz1267/elephant/releases/tag/v2.20.2

Reported by: GitHub (watch releases)