chore: fix JavaScript lint errors (issue #11082)

[fahimlisl]

Related Issues

resolves #11082

Description

Fixed a JavaScript linting failure detected in the automated lint
workflow. The stdlib/no-new-array rule disallows use of the new Array() constructor. Replaced the offending usage in deep_copy.js
with an array literal [], which is the idiomatic stdlib convention.

File changed:
lib/node_modules/@stdlib/utils/copy/lib/deep_copy.js

Change:
```javascript
// Before
ref = ( isArray( x ) ) ? new Array( x.length ) : {};

// After
ref = ( isArray( x ) ) ? [] : {};
```

Checklist

• The fix addresses the lint error reported in the automated workflow
• No unrelated files were modified
• Commit message follows the project conventions
• Read, understood, and followed the contributing guidelines

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[fahimlisl]

I have read the contributing guidelines and I agree to follow them.

[kgryte]

Ref: #11083

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