Add bun.lock and bun.lockb in `.prettierignore`

Current `.prettierignore` generated by `sv create` is
```shell
# Package Managers
package-lock.json
pnpm-lock.yaml
yarn.lock
```

Would be better if:
```shell
# Package Managers
package-lock.json
pnpm-lock.yaml
yarn.lock
bun.lock
bun.lockb
```