sysutils/elephant: Update to 2.10.4

Changelog:

• https://github.com/abenz1267/elephant/releases/tag/v2.7.10
• https://github.com/abenz1267/elephant/releases/tag/v2.7.11
• https://github.com/abenz1267/elephant/releases/tag/v2.8.0
• https://github.com/abenz1267/elephant/releases/tag/v2.9.0
• https://github.com/abenz1267/elephant/releases/tag/v2.9.1
• https://github.com/abenz1267/elephant/releases/tag/v2.9.2
• https://github.com/abenz1267/elephant/releases/tag/v2.9.3
• https://github.com/abenz1267/elephant/releases/tag/v2.10.0
• https://github.com/abenz1267/elephant/releases/tag/v2.10.1
• https://github.com/abenz1267/elephant/releases/tag/v2.10.2
• https://github.com/abenz1267/elephant/releases/tag/v2.10.3
• https://github.com/abenz1267/elephant/releases/tag/v2.10.4

Reported by: GitHub (watch releases)