Bump postcss-import from 15.1.0 to 16.1.0

Bumps [postcss-import](https://github.com/postcss/postcss-import) from 15.1.0 to 16.1.0.
- [Release notes](https://github.com/postcss/postcss-import/releases)
- [Changelog](https://github.com/postcss/postcss-import/blob/master/CHANGELOG.md)
- [Commits](postcss/postcss-import@15.1.0...16.1.0)

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

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

Author: dependabot[bot]

package-lock.json

@@ -16,7 +16,7 @@
     "gulp": "^4.0.2",
     "gulp-postcss": "^9.1.0",
     "postcss": "^8.4.32",
-    "postcss-import": "^15.1.0"
+    "postcss-import": "^16.1.0"
   },
   "scripts": {
     "build:production": "cross-env NODE_ENV=production gulp",