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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AJV-15274295
- https://snyk.io/vuln/SNYK-JS-QS-15268416

Author: snyk-bot

plugins/search-backend-module-pg/package.json

@@ -36,11 +36,11 @@
     "clean": "backstage-cli package clean"
   },
   "dependencies": {
-    "@backstage/backend-common": "workspace:^",
+    "@backstage/backend-common": "0.24.1",
     "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/config": "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",
     "knex": "^2.0.0",
     "lodash": "^4.17.21",
     "uuid": "^8.3.2",