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]>

package.json

@@ -47,7 +47,7 @@
     "eslint": "^8.57.0",
     "eslint-config-standard": "^17.1.0",
     "htm": "^3.1.1",
-    "postcss-import": "^15.1.0",
+    "postcss-import": "^16.1.0",
     "postcss-nesting": "^12.1.2",
     "tap-spec": "^5.0.0",
     "tape-run": "^11.0.0",