SDK: Bump rollups-node version to v2.0.0-alpha.12

[brunomenezes]

📚 Context

Bump rollups-node version to the next v2.0.0-alpha.12.

Dependencies

• Depends on assets release on rollups-node repository

📈 Subtasks

• Set the new version CARTESI_ROLLUPS_NODE_VERSION variable on docker-bake.hcl.
• Update checksum for both arm64 and amd64 on Dockerfile.
• Verify whether everything is working as expected.