fix: correct syntax for peer deps

[noahflk]

Without this I wasn't able to install the library in an npm project. pnpm seems to be fine with the syntax either way.

The error I had before this fix

npm ERR! Found: next@12.2.4
npm ERR! node_modules/next
npm ERR!   next@"12.2.4" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer next@"12.x | 11.x" from next-international@0.1.1
npm ERR! node_modules/next-international
npm ERR!   next-international@"*" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

[QuiiBz]

Thanks for the PR! I don't use NPM anymore so I wasn't aware of this issue. LGTM