fix: plugins/config-schema/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/config-schema/package.json

@@ -23,11 +23,11 @@
     "clean": "backstage-cli package clean"
   },
   "dependencies": {
-    "@backstage/config": "workspace:^",
-    "@backstage/core-components": "workspace:^",
-    "@backstage/core-plugin-api": "workspace:^",
+    "@backstage/config": "0.1.1",
+    "@backstage/core-components": "0.1.0",
+    "@backstage/core-plugin-api": "0.1.0",
     "@backstage/errors": "workspace:^",
-    "@backstage/theme": "workspace:^",
+    "@backstage/theme": "0.1.1",
     "@backstage/types": "workspace:^",
     "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.9.1",