Bump npm API package to 1.8.1 (#1993)

## Summary
- Bump `@vscode/python-environments` from 1.8.0 to 1.8.1 and synchronize
the lockfile.
- Retrigger the official npm pipeline on merge to main after #1987.
- Keep the minimum extension version at 1.42.0; no API or changelog
changes.
- Replaces #1992 because its release-prefixed source branch prevents
follow-up pushes under existing branch protection.

## Validation
- API compilation, local release validation, four release-validator
tests, and packed ESM/CommonJS and TypeScript consumer checks passed.
- Root lint and type checking passed.
- Unit tests: 3,522 passing, 9 pending.
- Verified stable version-change detection and `git diff --check`.

Merging this PR triggers the main-branch npm release pipeline and its
existing publication approvals; this PR does not publish locally.

---------

Copilot-Session: 7992926e-a6ef-49ad-b6c9-120b52c0de51

Author: edvilme

api/package-lock.json

@@ -1,7 +1,7 @@
 {
     "name": "@vscode/python-environments",
     "description": "An API facade for the Python Environments extension in VS Code",
-    "version": "1.8.0",
+    "version": "1.8.1",
     "minimumExtensionVersion": "1.42.0",
     "author": {
         "name": "Microsoft Corporation"