misc/shimmy: update to 1.5.5

Changelog:

• https://github.com/Michael-A-Kuykendall/shimmy/releases/tag/v1.5.0
• https://github.com/Michael-A-Kuykendall/shimmy/releases/tag/v1.5.1
• https://github.com/Michael-A-Kuykendall/shimmy/releases/tag/v1.5.2
• https://github.com/Michael-A-Kuykendall/shimmy/releases/tag/v1.5.3
• https://github.com/Michael-A-Kuykendall/shimmy/releases/tag/v1.5.4
• https://github.com/Michael-A-Kuykendall/shimmy/releases/tag/v1.5.5

Reported by: GitHub (watch releases)