Local repository in package.json yields malformed error

**Description:**

When I run `ionic build` I get `[ERROR] The project's package.json file seems malformed.` but when I run `ng build` it succeeds.

The cause seems to be the addition of local repositories in my package.json

I fixed bugs in third party libraries, and am referencing my local forks like so:
```
{
"dependencies": {
...
"the-package-name": "file:../the-package-name",
...
}
}
```

The JSON is well-formed and parseable. `npm install` succeeds (and creates the symbolic link as `npm link` would), and `ng build` succeeds.

**Steps to Reproduce:**

Add your own local file dependency to package.json, then try to run `ionic build`.

**Output:**

ionic:lib Terminal info: { ci: false, shell: 'C:\\WINDOWS\\system32\\cmd.exe', tty: true, windows: true } +0ms
ionic:lib CLI global options: { _: [ 'build' ], help: null, h: null, verbose: true, quiet: null, interactive: true, color: true, confirm: null, json: null, project: null, '--': [] } +4ms
ionic:lib:project Project type from config: @ionic/angular (angular) +0ms
ionic:lib:project Project details: { context: 'app', type: 'angular', errors: [], configPath: 'C:\\code\\dirtbag\\ionic.config.json' } +0ms
ionic Context: { binPath: 'C:\\Users\\byron\\AppData\\Roaming\\npm\\node_modules\\@ionic\\cli\\bin\\ionic', libPath: 'C:\\Users\\byron\\AppData\\Roaming\\npm\\node_modules\\@ionic\\cli', execPath: 'C:\\code\\dirtbag', version: '6.12.4' } +0ms
ionic:lib:build build options: {
ionic:lib:build '--': [],
ionic:lib:build engine: 'browser',
ionic:lib:build platform: undefined,
ionic:lib:build project: 'app',
ionic:lib:build verbose: true,
ionic:lib:build configuration: undefined,
ionic:lib:build sourcemaps: undefined,
ionic:lib:build cordovaAssets: true,
ionic:lib:build watch: undefined,
ionic:lib:build type: 'angular'
ionic:lib:build } +0ms
ionic:lib:telemetry Sending telemetry for command: 'ionic build' [ '--verbose', '--interactive', '--color' ] +0ms
ionic:lib:build Looking for ionic:build npm script. +12ms
[ERROR] The project's package.json file seems malformed.
ionic:utils-process onBeforeExit handler: 'process.exit' received +0ms
ionic:utils-process onBeforeExit handler: running 0 functions +1ms
ionic:utils-process processExit: exiting (exit code: 1) +0ms

**My `ionic info`:**

```
Ionic:

Ionic CLI : 6.12.4 (C:\Users\byron\AppData\Roaming\npm\node_modules\@ionic\cli)
Ionic Framework : @ionic/angular 5.5.3
@angular-devkit/build-angular : 0.1101.4
@angular-devkit/schematics : 10.0.8
@angular/cli : 11.1.4
@ionic/angular-toolkit : 2.3.3

Capacitor:

Capacitor CLI : 2.4.6
@capacitor/core : 2.4.6

Utility:

cordova-res : 0.15.3
native-run : not installed

System:

NodeJS : v16.13.0 (C:\Program Files\nodejs\node.exe)
npm : 8.1.0
OS : Windows 10
```

**Other Information:**