tech/migrate from postcss to lightningcss

[laruiss]

• chore: 🏗️ replace postcss by lightningcss
• fix: 🏷️ allow null value in DsfrInput

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[github-actions[bot]]

:tada: This issue has been resolved in version 5.18.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: