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

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

Author: snyk-io[bot]

plugins/devtools-backend/package.json

@@ -22,16 +22,16 @@
     "postpack": "backstage-cli package postpack"
   },
   "dependencies": {
-    "@backstage/backend-common": "workspace:^",
-    "@backstage/backend-plugin-api": "workspace:^",
+    "@backstage/backend-common": "0.24.1",
+    "@backstage/backend-plugin-api": "0.1.0",
     "@backstage/cli-common": "workspace:^",
     "@backstage/config": "workspace:^",
-    "@backstage/config-loader": "workspace:^",
+    "@backstage/config-loader": "0.1.1",
     "@backstage/errors": "workspace:^",
     "@backstage/plugin-auth-node": "workspace:^",
-    "@backstage/plugin-devtools-common": "workspace:^",
+    "@backstage/plugin-devtools-common": "0.1.0",
     "@backstage/plugin-permission-common": "workspace:^",
-    "@backstage/plugin-permission-node": "workspace:^",
+    "@backstage/plugin-permission-node": "0.1.0",
     "@backstage/types": "workspace:^",
     "@manypkg/get-packages": "^1.1.3",
     "@types/express": "*",