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

@@ -60,7 +60,7 @@
     "@backstage/plugin-catalog-node": "workspace:^",
     "@backstage/plugin-permission-common": "workspace:^",
     "@backstage/plugin-permission-node": "workspace:^",
-    "@backstage/plugin-scaffolder-common": "workspace:^",
+    "@backstage/plugin-scaffolder-common": "1.0.0",
     "@backstage/plugin-scaffolder-node": "workspace:^",
     "@backstage/types": "workspace:^",
     "@gitbeaker/core": "^35.6.0",