Fix sourcemap issue

[owjs3901]

No description provided.

[changeset-bot]

🦋 Changeset detected

Latest commit: 59b1a41

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@devup-ui/webpack-plugin	Patch
@devup-ui/next-plugin	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
packages/webpack-plugin/src/loader.ts	100.00% <100.00%> (ø)

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