dev: Update Scarb to 2.6.3

[b-j-roberts]

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

Update dependencies and self to scarb 2.6.3 and snforge 0.19.0

This is needed to allow us to use the latest versions of openzeppelin and Alexandria, including the latest sol_abi in Alexandria required for #69 . NOTE: This PR depends on a commit in this PR on succinct-starknet : https://github.com/keep-starknet-strange/succinct-starknet/pull/10

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

1 Ignored Deployment

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **blobstream-starknet** | ⬜️ Ignored ([Inspect](https://vercel.com/keep-starknet-strange/blobstream-starknet/GbhdddVfrdKgQu4bcw2ahZiW4g5G)) | | | Mar 19, 2024 2:08pm |