fix(deps): update dependency vscode-css-languageservice to v6.3.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
vscode-css-languageservice	6.3.0 -> 6.3.1

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Release Notes

Microsoft/vscode-css-languageservice (vscode-css-languageservice)

### [`v6.3.1`](https://togithub.com/microsoft/vscode-css-languageservice/releases/tag/v6.3.1) [Compare Source](https://togithub.com/Microsoft/vscode-css-languageservice/compare/v6.3.0...v6.3.1) #### Changes: - [#​405](https://togithub.com/Microsoft/vscode-css-languageservice/issues/405): update custom-data - [#​404](https://togithub.com/Microsoft/vscode-css-languageservice/issues/404): prepare 6.3.1 - [#​400](https://togithub.com/Microsoft/vscode-css-languageservice/issues/400): fix: support for conditional exports in sass's pkg This list of changes was [auto generated](https://dev.azure.com/monacotools/Monaco/\_build/results?buildId=289902\&view=logs).

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Configuration

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[renovate[bot]]

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