Bump version to 5.9

[DanielRosenwasser]

No description provided.

[typescript-bot]

Looks like you're introducing a change to the public API surface area. If this includes breaking changes, please document them on our wiki's API Breaking Changes page.

Also, please make sure @DanielRosenwasser and @RyanCavanaugh are aware of the changes, just as a heads up.

[jakebailey]

Missing the update to package-lock.json too.

[kachick]

Is it intentional for this commit to be in v5.8.3? v5.8.2 seems to have the same version number in its package.json.

https://github.com/microsoft/TypeScript/blob/v5.8.3/package.json#L5
https://github.com/microsoft/TypeScript/blob/v5.8.2/package.json#L5

I noticed this while debugging NixOS/nixpkgs#398716.

[jakebailey]

It's a mistake, but publishing to npm overrides this so what's on npm is correct (note the package.json there). If you're building from the source you may need to do that too, unfortunately.

[kachick]

Thanks so much for the detailed response to my questions. I really appreciate it.