Transforming const to the configured target environment ("es5") is not supported yet

Running drizzle-kit on a fresh nextjs typescript repo errors out:

```sh
> drizzle-kit generate:pg

drizzle-kit: v0.19.13
drizzle-orm: v0.28.6

No config path provided, using default 'drizzle.config.ts'
Reading config file '/Users/bas/REPOS/booleanart/drizzle.config.ts'
Error: Transform failed with 2 errors:
/Users/bas/REPOS/booleanart/src/database/schema.ts:12:7: ERROR: Transforming const to the configured target environment ("es5") is not supported yet
/Users/bas/REPOS/booleanart/src/database/schema.ts:33:7: ERROR: Transforming const to the configured target environment ("es5") is not supported yet
```

This should not happen as target:es5 is the correct one for NextJS (for now).
Issue is esbuild is complaining (while TypeScript will happily transpile target:es5 for const).