fixed ESM externlas and updated version

[timea-solid]

No description provided.

[Copilot]

Pull request overview

This PR fixes the ESM external configuration in webpack and bumps the package version from 4.0.1 to 4.0.2. The key change updates the webpack externals configuration for ESM builds to use the proper webpack 5 syntax for ES module imports.

• Updated externalsESM to use the correct webpack 5 object format { import: 'rdflib' } for ESM external dependencies
• Removed the spread of externalsBase from externalsESM, leaving only rdflib as an external dependency for ESM builds
• Bumped the package version to 4.0.2 as a patch release

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
webpack.config.mjs	Fixed ESM external configuration to use proper webpack 5 syntax for the rdflib dependency, removing UMD-specific externals that don't apply to ESM builds
package.json	Bumped version from 4.0.1 to 4.0.2 to reflect the bug fix

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[timea-solid]

This does not work. Bug in webpack.