Bump postcss from 8.5.14 to 8.5.15

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.14 to 8.5.15.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.5.14...8.5.15)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.15
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -53,7 +53,7 @@
     "@types/lodash-es": "4.17.12",
     "jsdom": "29.1.1",
     "playwright-ng-schematics": "^21.1.0",
-    "postcss": "8.5.14",
+    "postcss": "8.5.15",
     "prettier": "3.8.3",
     "tailwindcss": "4.3.0",
     "typescript": "5.9.3",