bug: peer dependency error with React 16 / React 17

[MPeloquin]

Describe the bug

The peer dependencies have "react": "^18.0.0 || ^17.0.0 || ^16.8.0", but if you install it with react 16.8, there will be peer-dependencies issues because of react-markdown 9.0.0 which has "react": ">=18" in its peer-dependencies.

It seems to work at runtime for us locally, but was breaking our tests & build

It is ok to drop support for old React versions, but it should be clear in the peer-dependencies so we don't try to update yet

To Reproduce

Steps to reproduce the behavior:

1. Have project with React 16
2. Install latest stream-chat-react
3. run install
4. See peer-dependencies issue:

└─┬ stream-chat-react 11.2.1
  └─┬ react-markdown 9.0.1
    └── ✕ unmet peer react@>=18: found 16.14.0

Expected behavior

Peer-dependencies of stream-chat-react should reflect real version needs

Package version

• stream-chat-react: 11.2.1

Desktop (please complete the following information):

• OS: macos
• Browser chrome
• Version latest