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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-TARFS-9535930

Author: snyk-io[bot]

packages/core-plugin-api/package.json

@@ -45,9 +45,9 @@
     "start": "backstage-cli package start"
   },
   "dependencies": {
-    "@backstage/config": "workspace:^",
+    "@backstage/config": "0.1.1",
     "@backstage/types": "workspace:^",
-    "@backstage/version-bridge": "workspace:^",
+    "@backstage/version-bridge": "0.1.0",
     "@types/react": "^16.13.1 || ^17.0.0",
     "history": "^5.0.0",
     "prop-types": "^15.7.2",