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

@@ -45,10 +45,10 @@
     "clean": "backstage-cli package clean"
   },
   "dependencies": {
-    "@backstage/backend-common": "workspace:^",
-    "@backstage/backend-plugin-api": "workspace:^",
-    "@backstage/config": "workspace:^",
-    "@backstage/config-loader": "workspace:^",
+    "@backstage/backend-common": "0.25.0",
+    "@backstage/backend-plugin-api": "1.6.1",
+    "@backstage/config": "0.1.1",
+    "@backstage/config-loader": "0.6.10",
     "@backstage/types": "workspace:^",
     "@types/express": "^4.17.6",
     "express": "^4.17.1",
@@ -57,7 +57,7 @@
     "globby": "^11.0.0",
     "helmet": "^6.0.0",
     "knex": "^2.0.0",
-    "lodash": "^4.17.21",
+    "lodash": "^4.17.23",
     "luxon": "^3.0.0",
     "winston": "^3.2.1",
     "yn": "^4.0.0"