fix: packages/backend-openapi-utils/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AJV-15274295

Author: snyk-io[bot]

packages/backend-openapi-utils/package.json

@@ -31,7 +31,7 @@
     "dist"
   ],
   "dependencies": {
-    "@backstage/errors": "workspace:^",
+    "@backstage/errors": "0.1.1",
     "@types/express": "^4.17.6",
     "@types/express-serve-static-core": "^4.17.5",
     "express": "^4.17.1",