Runnify command fails on windows

Runnify command fails on windows

```
$ bob runnify --single
```

```
PrettyError: Cannot find C:\projects\hive\graphql-hive\packages\server\src\index.ts
at normalizeOptions (C:\projects\hive\graphql-hive\node_modules\tsup\dist\index.js:1984:13)
at processTicksAndRejections (internal/process/task_queues.js:95:5)
at async C:\projects\hive\graphql-hive\node_modules\tsup\dist\index.js:2014:21
at async Promise.all (index 0)
at async Object.build (C:\projects\hive\graphql-hive\node_modules\tsup\dist\index.js:2011:3)
at async compile (C:\projects\hive\graphql-hive\node_modules\bob-the-bundler\dist\commands\runify.js:161:9)
at async runify (C:\projects\hive\graphql-hive\node_modules\bob-the-bundler\dist\commands\runify.js:93:9)
```