build(deps): bump openapi-backend from 5.18.0 to 5.20.0 (#8098)

Bumps [openapi-backend](https://github.com/openapistack/openapi-backend) from 5.18.0 to 5.20.0.
- [Release notes](https://github.com/openapistack/openapi-backend/releases)
- [Commits](openapistack/openapi-backend@5.18.0...5.20.0)

---
updated-dependencies:
- dependency-name: openapi-backend
  dependency-version: 5.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pnpm-lock.yaml

@@ -66,7 +66,7 @@
     "nano": "^11.0.6",
     "nodemailer": "^9.0.5",
     "oidc-provider": "9.11.2",
-    "openapi-backend": "^5.18.0",
+    "openapi-backend": "^5.20.0",
     "pdfkit": "^0.19.1",
     "pg": "^8.22.0",
     "prom-client": "^15.1.3",