chore(deps): bump npm (#9205)

Bumps the test-versions group with 1 update in the /packages/dd-trace/test/plugins/versions directory: [npm](https://github.com/npm/cli).


Updates `npm` from 11.17.0 to 11.18.0
- [Release notes](https://github.com/npm/cli/releases)
- [Changelog](https://github.com/npm/cli/blob/v11.18.0/CHANGELOG.md)
- [Commits](npm/cli@v11.17.0...v11.18.0)

---
updated-dependencies:
- dependency-name: npm
  dependency-version: 11.18.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: test-versions
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

packages/dd-trace/test/plugins/versions/package.json

@@ -182,7 +182,7 @@
     "node-24": "npm:node@24.16.0",
     "node-26": "npm:node@26.2.0",
     "node-serialize": "0.0.4",
-    "npm": "11.17.0",
+    "npm": "11.18.0",
     "nyc": "18.0.0",
     "office-addin-mock": "2.4.6",
     "openai": "6.44.0",