The previous RegExp for data routes when i18n was enabled yielded a pattern like:
```
^\/_next\/data\/development\/(?<nextLocale>.+?)\/about.json$
^\/_next\/data\/development\/(?<nextLocale>.+?)\/blog/about.json$
```
But the capture group for the `nextLocale` did so greedily, where the following:
```
/_next/data/development/en-US/blog/about.json
```
Would actually match both routes.
This changes it to prevent the locale from including a `/` via `[^/]`, resulting in the new expressions:
```
^\/_next\/data\/development\/(?<nextLocale>[^/]+?)\/about.json$
^\/_next\/data\/development\/(?<nextLocale>[^/]+?)\/blog/about.json$
```
