contrib: Add @0xicosahedron as a contributor

[b-j-roberts]

• [ ] issue #
• [x] follows contribution guide
• [ ] code change includes tests
• [ ] breaking change

Add @0xicosahedron as a contributor

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Name	Status	Preview	Comments	Updated (UTC)
blobstream-starknet	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 26, 2024 3:44pm