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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BABELRUNTIME-10044504

Author: snyk-io[bot]

plugins/rollbar-backend/package.json

@@ -33,8 +33,8 @@
     "clean": "backstage-cli package clean"
   },
   "dependencies": {
-    "@backstage/backend-common": "workspace:^",
-    "@backstage/config": "workspace:^",
+    "@backstage/backend-common": "0.24.1",
+    "@backstage/config": "0.1.1",
     "@types/express": "^4.17.6",
     "compression": "^1.7.4",
     "cors": "^2.8.5",