message: fix(proxy): private package for now
diff: {
  "name": "@backstage/plugin-proxy-backend",
  - "version": "0.1.1-alpha.12",
  + "version": "0.1.1-alpha.13",
  "main": "src/index.ts",
  "types": "src/index.ts",
  "license": "Apache-2.0",
  - "private": false,
  + "private": true,
  "publishConfig": {
  "access": "public",
  "main": "dist/index.cjs.js",
  