Bump open-props from 1.5.15 to 1.6.3

Bumps [open-props](https://github.com/argyleink/open-props) from 1.5.15 to 1.6.3.
- [Release notes](https://github.com/argyleink/open-props/releases)
- [Commits](https://github.com/argyleink/open-props/commits)

---
updated-dependencies:
- dependency-name: open-props
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -37,7 +37,7 @@
     "@web/test-runner": "^0.17.1",
     "eslint": "^8.50.0",
     "eslint-plugin-github": "^4.10.0",
-    "open-props": "^1.5.15",
+    "open-props": "^1.6.3",
     "postcss": "^8.4.30",
     "postcss-cli": "^10.1.0",
     "postcss-import": "^15.1.0",