chore: bump @stoplight/spectral-cli from 6.14.3 to 6.15.0

Bumps [@stoplight/spectral-cli](https://github.com/stoplightio/spectral) from 6.14.3 to 6.15.0.
- [Release notes](https://github.com/stoplightio/spectral/releases)
- [Changelog](https://github.com/stoplightio/spectral/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/stoplightio/spectral/compare/@stoplight/spectral-cli-6.14.3...@stoplight/spectral-cli-6.15.0)

---
updated-dependencies:
- dependency-name: "@stoplight/spectral-cli"
  dependency-version: 6.15.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -1,6 +1,6 @@
 {
   "devDependencies": {
     "@prettier/plugin-php": "^0.22.4",
-    "@stoplight/spectral-cli": "^6.14.3"
+    "@stoplight/spectral-cli": "^6.15.0"
   }
 }