fix(test): use cross-platform path check in globs tests

Replace `startsWith('/')` checks with `path.isAbsolute()` to handle
both Unix-style paths (`/path/to/file`) and Windows paths (`C:\path\to\file`)
correctly. This fixes test failures on Windows where absolute paths start
with drive letters instead of forward slashes.

Fixes tests in both glob() and globSync() test suites.

Author: jdalton

test/unit/globs.test.ts

@@ -13,6 +13,7 @@
  * Used by Socket tools for file discovery and npm package analysis.
  */
 
+import path from 'node:path'
 import {
   defaultIgnore,
   getGlobMatcher,
@@ -359,7 +360,7 @@ describe('globs', () => {
       })
       expect(Array.isArray(files)).toBe(true)
       if (files.length > 0) {
-        expect(files[0].startsWith('/')).toBe(true)
+        expect(path.isAbsolute(files[0])).toBe(true)
       }
     })
 
@@ -442,7 +443,7 @@ describe('globs', () => {
       })
       expect(Array.isArray(files)).toBe(true)
       if (files.length > 0) {
-        expect(files[0].startsWith('/')).toBe(true)
+        expect(path.isAbsolute(files[0])).toBe(true)
       }
     })