Release 4 new icons and 7 updated icons (v5.15.0)

New Icons

• Autoprefixer (#6496, #6513)
• Franprix (#6539)
• GoCD (#6195)
• Spring Security (#6206)
• Tesco (#6431)

Updated Icons

• Cytoscape.js (#6513)
• Equinix Metal (#6513)
• Nuxt.js (#6540)
• Semaphore CI (#6513)
• Tailwind CSS (#6553)
• TUI (#6553)