Bump purgecss from 6.0.0 to 7.0.2 in /wwwsrc

Bumps [purgecss](https://github.com/FullHuman/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: purgecss
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

wwwsrc/package.json

@@ -10,7 +10,7 @@
     "cssnano": "^7.0.1",
     "cssnano-preset-advanced": "^7.0.1",
     "postcss-cli": "^11.0.0",
-    "purgecss": "^6.0.0",
+    "purgecss": "^7.0.2",
     "react": "^18.3.1",
     "react-bootstrap": "^2.8.0",
     "react-bootstrap-icons": "^1.11.4",