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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-TAR-15038581
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-14908844
- https://snyk.io/vuln/SNYK-JS-BACKSTAGEBACKENDPLUGINAPI-15054291
- https://snyk.io/vuln/SNYK-JS-LODASH-15053838
- https://snyk.io/vuln/SNYK-JS-LODASHES-15053836
- https://snyk.io/vuln/SNYK-JS-DIFF-14917201

Author: snyk-bot

plugins/linguist-backend/package.json

@@ -22,14 +22,14 @@
     "postpack": "backstage-cli package postpack"
   },
   "dependencies": {
-    "@backstage/backend-common": "workspace:^",
-    "@backstage/backend-plugin-api": "workspace:^",
+    "@backstage/backend-common": "0.25.0",
+    "@backstage/backend-plugin-api": "1.6.1",
     "@backstage/backend-tasks": "workspace:^",
-    "@backstage/catalog-client": "workspace:^",
+    "@backstage/catalog-client": "0.2.0",
     "@backstage/catalog-model": "workspace:^",
-    "@backstage/config": "workspace:^",
+    "@backstage/config": "0.1.1",
     "@backstage/errors": "workspace:^",
-    "@backstage/plugin-auth-node": "workspace:^",
+    "@backstage/plugin-auth-node": "0.6.0",
     "@backstage/plugin-linguist-common": "workspace:^",
     "@backstage/types": "workspace:^",
     "@types/express": "*",