Bump openapi-backend from 5.11.1 to 5.12.0

Bumps [openapi-backend](https://github.com/openapistack/openapi-backend) from 5.11.1 to 5.12.0.
- [Commits](openapistack/openapi-backend@5.11.1...5.12.0)

---
updated-dependencies:
- dependency-name: openapi-backend
  dependency-version: 5.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: pnpm-lock.yaml

@@ -58,7 +58,7 @@
     "measured-core": "^2.0.0",
     "mime-types": "^3.0.1",
     "oidc-provider": "^8.8.1",
-    "openapi-backend": "^5.11.1",
+    "openapi-backend": "^5.12.0",
     "proxy-addr": "^2.0.7",
     "rate-limiter-flexible": "^7.0.0",
     "rehype": "^13.0.2",