(examples/with-urql): fixes graphql server url (#25987)
## Documentation / Examples
- [x] Make sure the linting passes
As mentioned in #25854 `with-urql` doesn't work. After investigation, I've found that Pokémon GraphQL server located at `https://graphql-pokemon.vercel.app` is down.
After some research I came across its repository and this [pull request](https://github.com/lucasbento/graphql-pokemon/pull/14). That pull request provides new URL `https://graphql-pokemon2.vercel.app` which seems to work.
I don't know the status of this server, maybe @leerob can confirm this PR is ok.
