fix: packages/backend-plugin-api/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-DIFF-14917201
- https://snyk.io/vuln/SNYK-JS-BACKSTAGEBACKENDPLUGINAPI-15054291

Author: snyk-io[bot]

packages/backend-plugin-api/package.json

@@ -32,10 +32,10 @@
     "start": "backstage-cli package start"
   },
   "dependencies": {
-    "@backstage/backend-tasks": "workspace:^",
+    "@backstage/backend-tasks": "0.6.1",
     "@backstage/config": "workspace:^",
-    "@backstage/plugin-auth-node": "workspace:^",
-    "@backstage/plugin-permission-common": "workspace:^",
+    "@backstage/plugin-auth-node": "0.5.0",
+    "@backstage/plugin-permission-common": "0.1.0",
     "@backstage/types": "workspace:^",
     "@types/express": "^4.17.6",
     "express": "^4.17.1",