Upgrade: [dependabot] - bump @redocly/cli from 2.20.1 to 2.20.4

Bumps [@redocly/cli](https://github.com/Redocly/redocly-cli) from 2.20.1 to 2.20.4.
- [Release notes](https://github.com/Redocly/redocly-cli/releases)
- [Commits](https://github.com/Redocly/redocly-cli/compare/@redocly/cli@2.20.1...@redocly/cli@2.20.4)

---
updated-dependencies:
- dependency-name: "@redocly/cli"
  dependency-version: 2.20.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -18,6 +18,6 @@
   },
   "homepage": "https://github.com/NHSDigital/eps-prescription-status-update-api",
   "devDependencies": {
-    "@redocly/cli": "^2.20.1"
+    "@redocly/cli": "^2.20.4"
   }
 }