Bump @redocly/cli from 2.20.4 to 2.21.0 in the npm-minor-patch group (#1283)

* Bump @redocly/cli from 2.20.4 to 2.21.0 in the npm-minor-patch group

Author: dependabot[bot]

package-lock.json

@@ -15,7 +15,7 @@
   "license": "MIT",
   "homepage": "https://github.com/NHSDigital/immunisation-fhir-api",
   "devDependencies": {
-    "@redocly/cli": "^2.20.4",
+    "@redocly/cli": "^2.21.0",
     "husky": "^9.1.7",
     "lint-staged": "^16.3.3",
     "prettier": "^3.8.1"