Bump postcss-import from 15.1.0 to 16.1.0 (#294)

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:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -32,7 +32,7 @@
     "@11ty/eleventy": "^2.0.1",
     "cssnano": "^7.0.6",
     "postcss": "^8.5.1",
-    "postcss-import": "^15.1.0",
+    "postcss-import": "^16.1.0",
     "postcss-mixins": "^9.0.4",
     "postcss-nested": "^6.0.1",
     "postcss-simple-vars": "^7.0.1"