test: update maintained-node-versions test to use named import

Change from default import to named import:
- Before: import maintainedNodeVersionsModule from '...'
- After: import { maintainedNodeVersions } from '...'

Removes ESM/CJS interop workaround now that the module properly
exports named exports only.

Author: jdalton

test/unit/maintained-node-versions.test.ts

@@ -11,11 +11,7 @@
 
 import { describe, expect, it } from 'vitest'
 
-import maintainedNodeVersionsModule from '@socketsecurity/lib/maintained-node-versions'
-
-// Handle ESM/CJS interop - the module may be double-wrapped
-const maintainedNodeVersions =
-  (maintainedNodeVersionsModule as any).default || maintainedNodeVersionsModule
+import { maintainedNodeVersions } from '@socketsecurity/lib/maintained-node-versions'
 
 describe('maintained-node-versions', () => {
   describe('default export', () => {