fix: packages/core-plugin-api/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-DIFF-14917201
- https://snyk.io/vuln/SNYK-JS-BACKSTAGEBACKENDPLUGINAPI-15054291
- https://snyk.io/vuln/SNYK-JS-LODASH-15053838
- https://snyk.io/vuln/SNYK-JS-LODASHES-15053836

Author: snyk-io[bot]

packages/core-plugin-api/package.json

@@ -46,7 +46,7 @@
   },
   "dependencies": {
     "@backstage/config": "0.1.1",
-    "@backstage/types": "workspace:^",
+    "@backstage/types": "0.1.1",
     "@backstage/version-bridge": "0.1.0",
     "@types/react": "^16.13.1 || ^17.0.0",
     "history": "^5.0.0",