build(deps): bump postcss and styled-components

Bumps [postcss](https://github.com/postcss/postcss) and [styled-components](https://github.com/styled-components/styled-components). These dependencies needed to be updated together.

Updates `postcss` from 8.5.6 to 8.5.28
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.6...8.5.28)

Updates `styled-components` from 6.3.8 to 6.5.3
- [Release notes](https://github.com/styled-components/styled-components/releases)
- [Commits](https://github.com/styled-components/styled-components/compare/styled-components@6.3.8...styled-components@6.5.3)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.28
  dependency-type: direct:development
- dependency-name: styled-components
  dependency-version: 6.5.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -39,7 +39,7 @@
     "react-router-dom": "^7.13.0",
     "react-use": "^17.6.0",
     "sass": "^1.97.0",
-    "styled-components": "^6.3.8",
+    "styled-components": "^6.5.3",
     "swiper": "^9.2.0",
     "tailwind-merge": "^3.4.0",
     "typescript": "^4.9.5",
@@ -98,7 +98,7 @@
     "gh-pages": "^6.3.0",
     "globals": "^17.3.0",
     "jsdom": "^28.0.0",
-    "postcss": "^8.5.3",
+    "postcss": "^8.5.28",
     "prettier": "^3.8.0",
     "react-ga": "^3.3.1",
     "react-test-renderer": "^19.0.0",