fix: plugins/search-backend-node/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-HTTPPROXYMIDDLEWARE-9691387
- https://snyk.io/vuln/SNYK-JS-HTTPPROXYMIDDLEWARE-9691389

Author: snyk-io[bot]

plugins/search-backend-node/package.json

@@ -37,12 +37,12 @@
   },
   "dependencies": {
     "@backstage/backend-common": "workspace:^",
-    "@backstage/backend-plugin-api": "workspace:^",
-    "@backstage/backend-tasks": "workspace:^",
+    "@backstage/backend-plugin-api": "0.1.0",
+    "@backstage/backend-tasks": "0.6.1",
     "@backstage/config": "workspace:^",
     "@backstage/errors": "workspace:^",
     "@backstage/plugin-permission-common": "workspace:^",
-    "@backstage/plugin-search-common": "workspace:^",
+    "@backstage/plugin-search-common": "0.3.1",
     "@types/lunr": "^2.3.3",
     "lodash": "^4.17.21",
     "lunr": "^2.3.9",