Bug report: Resolution of the FN011008 SPFx project upgrade rule misses closing `}`

### Description

Resolution of the FN011008 SPFx project upgrade rule misses closing `}`

### Steps to reproduce

Upgrade SPFx v1.0.0 project to v1.1.3 or newer

### Expected result

```json
{
  "requiresCustomScript": true
}
```

### Actual result

```json
{
  "requiresCustomScript": true

```

### Environment

CLI v2.9