Bump postcss-preset-env from 6.7.2 to 9.5.15

Bumps [postcss-preset-env](https://github.com/csstools/postcss-plugins/tree/HEAD/plugin-packs/postcss-preset-env) from 6.7.2 to 9.5.15.
- [Changelog](https://github.com/csstools/postcss-plugins/blob/main/plugin-packs/postcss-preset-env/CHANGELOG.md)
- [Commits](https://github.com/csstools/postcss-plugins/commits/HEAD/plugin-packs/postcss-preset-env)

---
updated-dependencies:
- dependency-name: postcss-preset-env
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -16,7 +16,7 @@
         "node-forge": ">=0.10.0",
         "postcss-import": "^14.0.0",
         "postcss-nested": "^5.0.5",
-        "postcss-preset-env": "^6.7.0",
+        "postcss-preset-env": "^9.5.15",
         "vue-template-compiler": "^2.6.12"
     },
     "dependencies": {