React 19 Support

[sakgoyal]

can you check if React 19 is supported and add that to peer dependencies?

[dougg0k]

│ └─┬ react-shallow-renderer 16.15.0
│   └── ✕ unmet peer react@"^16.0.0 || ^17.0.0 || ^18.0.0": found 19.1.1