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

@@ -26,7 +26,7 @@
   "dependencies": {
     "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/catalog-model": "workspace:^",
-    "@backstage/plugin-scaffolder-common": "workspace:^",
+    "@backstage/plugin-scaffolder-common": "1.0.0",
     "@backstage/types": "workspace:^",
     "jsonschema": "^1.2.6",
     "winston": "^3.2.1",