chore(deps-dev): bump @fullhuman/postcss-purgecss in the postcss group (#1116)

Bumps the postcss group with 1 update: [@fullhuman/postcss-purgecss](https://github.com/FullHuman/purgecss).


Updates `@fullhuman/postcss-purgecss` from 6.0.0 to 7.0.2
- [Release notes](https://github.com/FullHuman/purgecss/releases)
- [Changelog](https://github.com/FullHuman/purgecss/blob/main/CHANGELOG.md)
- [Commits](FullHuman/purgecss@v6.0.0...v7.0.2)

---
updated-dependencies:
- dependency-name: "@fullhuman/postcss-purgecss"
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: postcss
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -73,7 +73,7 @@
   },
   "devDependencies": {
     "@biomejs/biome": "1.9.4",
-    "@fullhuman/postcss-purgecss": "6.0.0",
+    "@fullhuman/postcss-purgecss": "7.0.2",
     "@tailwindcss/forms": "0.5.9",
     "@tailwindcss/typography": "0.5.15",
     "@types/node": "22.9.1",