fix: plugins/todo-backend/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]

plugins/todo-backend/package.json

@@ -29,15 +29,15 @@
     "start": "backstage-cli package start"
   },
   "dependencies": {
-    "@backstage/backend-common": "workspace:^",
-    "@backstage/backend-openapi-utils": "workspace:^",
+    "@backstage/backend-common": "0.24.1",
+    "@backstage/backend-openapi-utils": "0.0.1",
     "@backstage/backend-plugin-api": "workspace:^",
-    "@backstage/catalog-client": "workspace:^",
-    "@backstage/catalog-model": "workspace:^",
+    "@backstage/catalog-client": "0.2.0",
+    "@backstage/catalog-model": "0.1.1",
     "@backstage/config": "workspace:^",
     "@backstage/errors": "workspace:^",
     "@backstage/integration": "workspace:^",
-    "@backstage/plugin-catalog-node": "workspace:^",
+    "@backstage/plugin-catalog-node": "1.0.0",
     "@types/express": "^4.17.6",
     "express": "^4.17.1",
     "express-promise-router": "^4.1.0",