markdownlint

Update to version 0.37.3.

Make micromark-core-commonmark a direct dependency to satisfy strict dependency resolution (e.g., pnpm).

Add CI job that verifies tests pass when using pnpm (vs. npm).

Update export test to avoid "ExperimentalWarning: Importing JSON modules is an experimental feature and might change at any time".

Bump webpack-cli from 6.0.0 to 6.0.1