fix: plugins/search-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/search-backend/package.json

@@ -36,16 +36,16 @@
     "clean": "backstage-cli package clean"
   },
   "dependencies": {
-    "@backstage/backend-common": "workspace:^",
-    "@backstage/backend-openapi-utils": "workspace:^",
-    "@backstage/backend-plugin-api": "workspace:^",
+    "@backstage/backend-common": "0.24.1",
+    "@backstage/backend-openapi-utils": "0.0.1",
+    "@backstage/backend-plugin-api": "0.6.19",
     "@backstage/config": "workspace:^",
     "@backstage/errors": "workspace:^",
-    "@backstage/plugin-auth-node": "workspace:^",
+    "@backstage/plugin-auth-node": "0.6.0",
     "@backstage/plugin-permission-common": "workspace:^",
     "@backstage/plugin-permission-node": "workspace:^",
-    "@backstage/plugin-search-backend-node": "workspace:^",
-    "@backstage/plugin-search-common": "workspace:^",
+    "@backstage/plugin-search-backend-node": "0.1.2",
+    "@backstage/plugin-search-common": "0.3.1",
     "@backstage/types": "workspace:^",
     "@types/express": "^4.17.6",
     "dataloader": "^2.0.0",